Engine misfire

Already changed plugs, wires and caps. Still misfiring at idle and runs very rough. Checked fuel pressure, 35 psi. Checked all plugs, all firing. Could it be injectors?

I have a '90 model Ford Ranger. A couple of years ago, I had the exhaust manifold replaced and after getting the vehicle to the house, I noticed a part was missing. It goes to some pipe towards the front, but I'm not sure what the name of the part is, what is does, or if I really need it. I would be able to pick it out if I could see a diagram of the engine, but can't find one online. I was just wondering if someone could tell me where I could find a diagram online.

Thanks in advance.
Steve

I just looked at a picture of an 'EGR Tube".
The part is NOT an EGR Tube.

Thanks.
Steve

I think whats missing is part of my 'air cleaner assembly'. Is that possible? And, if so, would that cause me to have 'hard start' problems? My truck runs great, but it takes 3 or 4 attempts to start it. I hear the fuel pump come on and stop before trying to start the truck, but I still have to pump the accelerator for it to start.

Thanks.

Im not sure but could it be a preheater hose thats missing?

Engine is running rough at idle and all speeds and cold or hot.
I checked compression, plugs, fuel rail pressure, changed DIS module, tested coil pack ok. I put a timing light on all 4 cylinders right side. They all did the same. It will have a series of flashes than a skip (no flash) about every second or less. I made sure it wasn't just a defective timing light by hooking it to my Escort and there were no skips, just a steady flashing.
What could be causing this missing. Since it has a right and left coil pack(8spark plugs) Would the right and left coil packs both have to be skipping to cause the engine miss?

I was driving one day n my truck lost power and it was like it was running on two cylinders and I could smell fuel strongly. I replaced the coil pack plugs and wires and it ran OK for about a week. The truck has eight plugs and wires I didn't replace the other coil pack that's under the alternator. The symptoms are loss of power when it warms up. And it will run like crap for 5 minutes then it fixes itself then its up down up down.

The truck did not have any misfires that I could tell. Although since day one it felt like it was very weak on power even for a 2.3 engine. The other day while idling it started misfiring on at least one cylinder, sometimes two. And it is then that I noticed I have never seen the check engine light ever come on. So with a couple of ignition on and off I confirmed it does not come on.

I am sorry I never got to my question. My question is can I go the the wire that would flash the check engine light with a test light and kill two birds with one stone by either receiving the code(s) for the (misfire which I think are fuel related)and or determine if the ECU is bad by not getting signal back to the check engine light. When I jump the eec diagnostic plug does not that send the light flash signal back to the dash through a bus port. Or does that come straight from the ECU? If it comes of the plug what wire would it be? Thanks and sorry for the incomplete first message.

Engine misses at idle and black soot from tailpipe.

Hello,

I can not figure out why my engine runs great while engine is cold, as soon as the engine temperture is up to normal operating temperture. The engine starts missing at speeds around 35 to 45 mph. If you decelarate or accelerate above or below these speeds engine stops missing. Please email any info. That might help me.

Thanks

Jerry