91 Lumina 3.4 No Go AGain Ugh

ok a week ago i replaced the crank shaft sensor in the oil pan been driving fine a week now i was making a trip to Toronto today which is a couple hour drive i was pulling into my friends driveway thats not far from me after driving myself around shopping for a couple hours the car just shut down i tried restarting it but it seemed to wanna fire for like a moment then it wouldnt just turns over
what sensor would it most likey be now? after this i selling it cuz this 3.4 engine is killing me

I would check the wiring between the CKPS and the ICM first. IF that checks out (no cuts, corrosion, rubbed spots, etc....), then I'd suspect a bad ECM, especially if it's the original one, and has the service number 1227727 on it. That number was pretty failure prone due to water intrusion issues.

hi sorry for the delay i just got back from my holidays

umm what is the CKPS and the ICM?? how can u test the ECM?

and well i tested the fuel system i put a fuel pressure gauge on the rail and i turn the key to on it goes up to 60psi but then drops down to 0 i read in my book can be a regulator or pinched lines etc or even a leaking injector

basiclly i know i can replace the regulator easliy but how the heck do you know ur injector is leaking or how to test for it?

hi i did more testing

like i said earlier if i just turn on the key the pressure goes up to 60 then to 0

now i tried starting it it has done couple things

one when starting it goes to 35 psi when i stop turning it goes to 40 and drops to 0
or it has done
when starting it goes to 35 when i stop goes to 60psi then pauses and drops to 40 psi and is holding for a bit
or it just does when starting it goes to 35psi and then when i stop ot goes to 40 psi and holds

i checked if i get a spark and i do get one, so is it not getting gas or is it the computer or what not? and still what are those other abbrivations u said

hi i tried some more testing if i spray starter fluid in the intake it wont start

now i tried taking the front spark plugs right out and i prime the pump turning key on and letting it goe to 60psi then it drops to like 10psi and holds now i noticed that the middle cylinder is filling with gas only its full of gas and the other 2 didnt is that now the regulator problem or a sensor problem?

Just for reference to answer your question:

CKPS (CranKshaft Position Sensor)
ICM (Ignition Control Module)

It sounds like your fuel pressure bleed off is from the injector in the middle cylinder you're saying is filling with gas.