Engine makes pre-ignition sounds and loses power and stalls when driving uphill?

Great Info, although I had replaced both the fuel filter and the fuel pump less than 6 weeks ago, but I will do as you suggested due to low quality gasoline that we have here in Iraq. I went through the link for the fuel filter and wish to inquire here, where is that mass Air Flow sensor? My air filter cabinet does not have such a sensor. In fact, what puzzles me is that on Reverse gear the car mounts that steep street with no hesitation at all, and also while I drive at speeds like 80-100 km/hour it has no hesitation at all, drives so smoothly, it is only on D or (2) that it does hesitate. If it were a fuel problem how come on Reverse and during ordinary driving speed it doesn't show up?
Also, I will shoot a clip for the car as it experiences that hesitation phase and will post it here tomorrow. Once again, lots of thanks dear sir.

Oh, that one near the fuel rail and mounted on a bracket with two bolts. Yes, I do have it, I will check its connector.

By the way dear Ken L, what I meant by (Pre-Ignition sounds) is the same (Advance) knock experienced in an old model engine where there is a distributor and wires leading to the spark plugs. It is a disturbing sound as if a knock is occurring.

Here is the video clip (two clips), I believe it won't give a clue, the noise was wasted by the roaring engine exhaust manifold gasses leaking out.

In an earlier thread that lasted for months last year (and was about my PCM not functioning 100% right) I received an answer from one of our friends here telling that my own car model (unluckily for me) is something like OBD 1.5, neither (1) nor (2). This jumper code method didn't work for me, the three wires that the ALDL has are all (not live), all I was asked to do is check for continuity in one of them, and it was having continuity by then. Still, I will conduct it again this time since the PCM my car has now is a replacement for that faulty one which gave me a hell of difficulty for a whole year before I could get a replacement PCM and leave it all behind me. Additionally, I conducted a scanner test today. The technician failed to get a communication with my ALDL connector. This is what used to happen a year ago as I was trying to read some code to let me know what is causing my engine to stall and shut down all of a sudden. By the way, I replaced the fuel filter, there was sludge and mud choking the filter! In 6 hours from now I will be dismantling the whole fuel delivery rail along with the nozzles, most probably; the nozzle little filters will be in a terrible state.

Upon contacting a transmission expert here, I was asked to trace the wires of the transmission connector (images attached). He believes that two wires of them might be contacting each other and sending 2 commands for the (first gear) and (second gear) to engage during initial movement of the car. Any wiring diagram of this connector and how its wires connect to the PCM so that I can follow them to check for short circuit may be? The orange wire is the live one.

Quite fortunately, I came across a technician who has a scanner that deals with OBDI ALDL like my car's. The man knows too little (English and engineering stuff), somehow, this is what his old scanner could give, two runs in two separate images. The codes about low temperature coolant and low temperature transmission fluid are because I am using a thermal switch for the coolant radiator fan other than the original one, it closes the circuit at lower coolant temperatures. I will go through the list for other codes hoping to pinpoint what is wrong with my transmission that is making it lose its agility and act very sluggishly with stalling seizures.

I have a spare PCM, but I am not sure if it is not faulty. I will replace mine (N.B; My model is 1995, these frames seem to be for the 2005 model). I will be back for more, thanking you very much

Yesterday replaced the PCM. Nothing progressed well with the main issue of the car failing to ascend the easiest slopes, somehow, the combustion seems better now, the original PCM seems to have been delivering excess fuel in contrast with air intake (that stochiometric criteria not met). So far, I have tried replacing the PCM and the problem doesn't seem relevant to any PCM. The next thing to do is to replace the Airflow sensor (the one adjacent to the butterfly gate of the air intake manifold. This idea crossed my mind because I tried two solutions, and both worked out fine:
1. Disconnecting the connector of that air flow sensor. The engine air suction sound sure got doubled but the engine went horny, no problem experienced with ascending slopes. For this option, I will replace the airflow sensor and see if the problem changes its rhythm.

2. Disconnecting that connector of the transmission unit. The driving dispensed with automatic gear shifting as before (that is for sure) but the problem of failing to ascend slopes disappeared. For this option, the automatic transmission mechanic said that there seems to be some wires making contact with each other. He suggested tracing the wires of that grey connector all the way to the PCM.

I then replaced the TPS which again helped me none. The car still experiences consequent discontinuity of power, with the RPM pointer dropping a little right with every semi-stalling session, it still can't negotiate slopes, even very shallow slopes. A car mechanic whom I consulted today said that the vacuum line leading to the A/C climatic control console (and actuators) should never be connected to the vacuum canister which tops the transmission body, it should rather take vacuum from the canister behind the right-side head lamp. I will try doing that.

Yes, it is indeed. The whole thick harness extending as a U shape around the engine had all been dismantled as single wires in order to search for any probable discontinuity last year as I was trying to solve a mysterious abrupt death of the engine, hence the chaotic and unpleasant scene. I apologize for that.

Great news today dear Ken L. Your answer regarding the wiring yielded a finalization for this thread, at long last! I previewed and reconsidered all wires available to me, the harness was already dismantled, and I found a connector that goes to the transmission rear right side (somewhere below the ABS unit) having four wires that were fretted badly. I insulated them, and proceeded further to the rest of the wires facing me renewing all ties that are there, the next discovery was one of the eight wires of the Electronic Ignition Control Module connector, that yellow wire was loosely connected underneath the insulation tape (the connector is already a replacement since last year, hence the connections made). The car regained its agility, I had it tested, and it is as if a demon was released off it. I also cared to attach the A/C main vacuum line to the vacuum canister under the replenishment coolant tank, leaving the transmission vacuum canister "independent" with its own line of vacuum, all those years before now it was the transmission vacuum canister delivering vacuum through a (T) junction to the A/C climatic control console.
Many thanks to you for your patience and support, I am totally grateful to you.
P.S, thank you dear for the wiring diagrams, I surely need them for more to come of faults like this one, they arrived after my last message to you.