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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