i have a 1991 pontiac gta 5.7l automatic, it will start and idle fine revs up no problems till it gets to operating temp. then if it's shut if it won't refire unless it sits for an hour or more. installed new dist, coil, plugs, wires, fuel pump, and pcm. still has same issue any advice on where to look next would be really helpfull.

 

Did the dist. come w/ a new ignition module? They are heat senstive.
You need to get some tools to figure this out.
When it acts up next time check...
spark-you'll need a spark tester or use a screw driver inserted into the plug wire.
fuel pressure, you can buy or rent on at the auto chain stores like a-zone, adv. auto, ect...
injector pulse- noid light that hooks into the injector connector, it should flash when cranking. Rent one IDK? Buy, yes, the stores should have that as its a common type.

 

when you say it wont fire do you mean it wont start, or wont crank over?

if it wont crank over then its heat soak on the starter.
if it wont start then its possible heat geting to the module.

 

module is new, came with dist. engine turns over but won't start. fuel pressure at the rail is good. going to check resistance in the injectors.

 

id check to make sure you have spark and that the injectors are pulsing. if both of those things are happening then the timing has to be off.

 

I had a similar problem with another car, came to find out that the problem in mine was a bad head gasket because pressure was getting let out and it would heat engine and would shut off when it got too pressurized. what noises does it make? any stalling at sometimes?

 

the car would still start with a bad head gasket

 

k. but this is what happened with mine. it had a bad gasket and i didnt know but it would turn off periodicly and i kept driving it. it would run but once i hit freeway or a 50 road it would stall so id pull over and itd turn off so id wait about 20 minutes and id get it running again. also a quick question is does ur antifreeze push out?

 

head gaskets are good, engine has less then 2k miles since rebuild. resistance check on injectors found only 3 of them have 16 ohms resist. pulling the plug off the #1 injector will let it start and run.

 

sounds like #1 injector might be stuck open causing the engine to flood out. does the oil smell like gas?

 

found multiple injectors have failed, in the process of looking for new ones. not sure which ones to get so many differant opinions on which ones will work

 

id do an oil change after getting new injectors before driving it. if oil got into the gas it needs to be changed.