fuel pressure should be set by the stock pressure regulator, something like 60psi but check the owner manual

the owner manual may suggest some things to check if running so rich also

i would not be fiddling with the fuel pressure, thats not a good idea

2 things set the amount of fuel going in;

fuel pressure...this should be controlled by stock pressure regulator

the duration the injector is open each time... this is controlled by ecu

the ecu decides how long to open (how much fuel) based on the readings from the sensors... AFM, TPS, O2, Temp etc... there must be an issue with the inputs it receives and therefore one of the sensors

perhaps borrow sensors from someone else and start swapping them out till you find the issue

just thinking while i was writing... the CA18DE and DET injectors are different resistance or impedance.. perhaps you are using the DE injectors?

I have no clue how old the injectors are.... I doubt it'll be those though because all of the spark plugs are black and what are the odds that all of the injectors are faulty.... any other ideas?

Yeah I got sorta the same prob but with mine I think it's a fuel pressure/vacuum leaks, I can get mine to run with my foot on the gas but as soon as I release the accelerate cable it dies out,if your sparks r fouling it's way way to rich n should be burning off, how long/old are the injectors?

I checked the ecu for codes and it's clear.... I'll check the resistance at the ecu for the temp sender when I start it next.. just a quick question... how sensitive are these engine to fuel pressure? reason I ask is because I have an aeromotive fuel pressure regulator and have tried playing around with that to compensate for the rich condition by lowering the pressure to 20psi at idle with vacuum and roughly 28psi static

Check the temp sender for the ecu. It should be 70-90ohms at 60deg and 21-24ohms at 100deg. or code 13 should show in the ecu if it is faulty.

Maybe check the ecu for fault codes.

perhaps the ecu still thinks the engine is cool and continues to dump extra fuel? problem with temp sensor?

I checked the coil pack for battery voltage.. good
I checked for continuity on ground circuit .... good
I removed all injectors and cleaned them .... doubt all 4 are leaking

changed the plugs again last night and the car ran like a beast for about half an hour and then started to run on 3 cylinders.. pulled all the plugs and all were black and fowled... any other advice? also someone was telling me that it could be the air flow sensor... I checked it against the factory service manual and it's within specifications ... running out of ideas here guys

Most people straighten it up, and the results in the ECU thinking it's off idle and add more fuel like a accellerator pump jet.. Also, chipped ECUs will run like crap too. There are too many floating around these days. Unlikely to be weak spark with 4 coils, unless all 4 are cooked. Check your earths and measure the 12V at the coils while engine is running. Could also be old and leaky injectors.

the throttle position sensor? no I didn't move it