Question about 1996 Chevrolet C1500

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5.7 vortex, Runs rough, at least 3 dead cyl. Scanner indicates ignegtion advance at neg 15 to 28. New plug,rotor, cap, fuel filter, fuel pump, changed spider and ecm. Any body got any ideas.

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Take off the heads and inspect the cylinders for burnt valves and possible buildup of any kind, replace o-rings and possibly even the head gasket, you will be able to tell if its needed when you get there, throw it back together after doing all that and if its still running rough check your timing chain/belt, distributor, and possibly even the fuel injector heads

Posted on Sep 10, 2010

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1 Answer

1993 c1500 with 350 engine - runs rough right above idle


Ok first question. Did you install an AC Delco fuel pump? If not, change the pump. Other pumps do not maintain the pressure that is required by the system. You say you have installed a new disturber, insure you are time installed correctly. Rough running usually is a vacuum leak, usually you can find it by spraying cab. cleaner around the intake manifold and components. Hope it helps

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