My engine turns over but will not start won't start with starting fluid either

I am working on a 1990 ranger 2.3L. My customer put a used engine from another ranger in it, it is suppose to be from the same year. Ignition not firing and injectors not firing. I ckecked all fuses gone through the wiring schematics. Power up relay is working fine. The customer replaced coils, crank sensor. Ignition module, fuel pump before they brought it to me. There is 4 different computers for that year model with manual transmission. The truck they got the engine out of has been crushed. Do I need the numbers off of that computer or will any of the 4 computers work with this engine

I replaced the fuel pump twice because my truck would start with starting fluid thinking that was the problem and that the first one I bought was bad, but come to find out its a no spark problem. I replaced both coil packs, all 8 plugs and wires on it, along with a brand new battery and it still not sparking, now it wont start with starting fluid, both coil packs are brand new(i try not to buy refurbished parts) and they both have power going to the coil packs, I had my friend check the timing because I am familiar with timing and he said it has not jumped timed, I am desperately trying to get this going because I am a single dad and this is my only vehicle.

Had alternator go out, barely made it home after switching batteries three times. Switched to a new rebuilt alternator. Now it wont start. Everything checks out except, not getting injectors to spray, I removed the entire rail and had my wife turn key, no fuel spraying out of injectors. What is the malfunction. Please help!

Checked all fuses, they are all okay. Plus, truck has no security system, bypassed inertia, neutral safety switches, and fuel pump.
Removed fuel rail, had my wife turn key, no fuel spraying from injectors.

No distributor, it is a 1990 2.3L with dual (can not remember what they are called). It has fuel pressure in the rail. But injectors fail to spray fuel? I am leaning on buying the ICM, but I heard of so many persons buying the unit to nothing changing. I cannot afford the computer, and I cannot afford to let truck sit. I tried the self test but my "Check engine" bulb burnt out and wont accept new bulb, so I tried the self test with multi-meter, could not get that to work either.
I turn the key and fuel pump is pumping, starter is spinning very good, so I spray starting fluid in the air intake and motor comes to life a couple of seconds and dies. I need to know exactly which computer to replace.

Someone said there are four computers in my truck two wheel drive, no power windows, no power door locks, plain Jane Ranger, I just took it on a hundred mile round trip, three times last week. Two weeks ago, I mean. The alternator went out, it fried it again, after I rebuilt it, so I put a new rebuilt in, and it would not start. I have been messing with it, for ten days now, I am so far behind its pitiful. Mostly been online looking for answers. But the 2carpros are the best so far.

Found the problem. Remember I had checked all fuses. Well, this morning I started from scratch. Found out that someone had removed a fuse from under hood. Talk about sabotage. The EEC fuse was taken and who did it. Thank you guys from 2carpros. Have a good rest of the weekend.

Sincerely, Tom Jr. Truck runs like new.

Found the problem. Remember I had checked all fuses. Well, this morning I started from scratch. Followed directions from easy fix. Com. Found out that someone had removed a fuse from under hood. Talk about sabotage.
The eec fuse was taken and who did it, well that's gonna be on another web site. Thank you guys from 2carpros. Have a good rest of the weekend.
. Sincerely,
. Tom Jr.
. Truck runs like new.

If a person unplugs the fuel injector power supply one at a time will it reset the injector? Or is that even possible or just dumb information.

Reason is my ranger cranks but will not start and there was barley and pressure in the fuel rail after I try to start it. So I toggled the fuel pump to obtain enough power to the pump to push enough prime. To the rail. But it still wont start.

How do I check the fuil pressure regulator? Do ihave to to take it off or can it be tested while on

I was driving down the highway and the engine just cut off. Now it wont start back up.I wasnt gettin fire from the core pack so I went and got another one. Still no fire. The engine sounds like it wants to start but it acts like its out of gas. Its a full tank in it.I checked for loose or diconnected wires/vacume hoses. Nothing.I checked the fuel pump. Good.I made sure the injectors were getting fuel. Good. The only other thing I can think of is the computer. Im lost with it. Any input would be greatful. Thankx lee