have a 90 chevy k2500 with a 5.7 when you first start it up in the morning it will run good,after it warms up it will still idle but if you rev it up too high and hold it there or try and drive it it will stall, i pulled the code out of the comp. and it is a electronic spark timming code, it seems that the advance is gone from the truck? i have already replaced the ignition module,ignition coil, pick up coil, coolant temp sensor,spark control module . i have checked the ECM grounds. I can unplug the timming connector engine cold and hear a small change but engine running for a minute and there is no change in the engine. truck has 160k on it the motor has aprox 10 - 15k on it please help im really pulling my hair on this one

thank you
chad

I believe that is a TBI system. There is no port to hook a fuel pressure gauge to so it makes it hard to test but a fuel pressure reading would be a must. Also a vacuum reading at idle & high rpm...........

fuel pump is only 2 weeks old brand new not reman. i will get a vac reading for you thanks

just wanted to let all know that it was the fuel pump still after ik replaced it. see what happened is when i put the new pump in the pick-up screen fell off in the bottom of the tank and yall probbibly know what happend from there. thats why the feul pump didnt fix the problem.

Appreciate follow up fixes to problems,

T
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Tom Greenleaf - MetroWest, Boston