Number 4 cylinder misfire

Asked by Apr 15, 2018 at 06:32 PM about the Chevrolet Silverado 1500

Question type: Maintenance & Repair

Could anyone tell me what could cause my engine
to miss under a load or at mid rpm range around
3000rpm or above followed with massive power
loss a few seconds into it ?
it throws a #4 cylinder misfire code p0304 .
I've give it complete tune up plugs,wires,distributor,
distributor cap,rotor button, changed maf sensor
,maintains 50psi fuel pressure while driving
,checked compression it seemed to be fine also at
around 150psi

1 Answer

113,805

Dirty injector, possible intake leak on that cylinder, valves not opening fully, engine control not firing number 4 intermittent, going to need some shop to at a minimum do a scope check and go from there.

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