I have a '95 chevy Silverado 4x4 5.7L. After tunning it up,(plugs,wires, dist. cap,& rotor button) I drove it about 10 miles it was running great then it started missing very bad. I got it home and checked everything that I had put on it and it was all good. It idles ok but when you give it gas exspecially while drining it misses. I have since put on a EGR valve, o2 sensor, & gas filter, checked all the vaccum hoses, the map sensor
& TPS sensor checkes out ok by ohms meter. I'm stumped. It acts like it might not be getting enough fuel but while in park it revs up ok with just a little bit of miss. Is it the ecm, fuel pump, coil, pick-up coil or what? Please help!

 

UPDATE!!! I took the truck to a really good mechanic and he done everything he knew to do and couldn't locate the problem. He put in a different distrubtor, check fuel pump pressure, map sensor, TPS sensor, idle air control, smoke test for vacuum leaks and was normal. He said that he could not read the computer with his machine connected. Im thinking it may need a new ECM (computer). Does anyone out there have any thoughts on this problem?

 

have the injectors themselves been checked?

 

What tuning software is your technician using? And finding an ECM isn't that tough. I found mine at a salvage yard.