exactly what i meant, the tech is claiming the headers are causing false knock, which i'm ASSuming he is blaming the false knock for the cylinder #8 misfire...... which isnt possible.
if its picking up false knock (like alot of GMs do anyways) then it would simply pull timing, not cause a noticeable misfire above XXXX rpm, loss of power, but definately not a SINGLE cylinder misfire.
even real knock (detonation or pre-ignition) shouldnt theoretically cause a misfire either, so using knock as the cause of a misfire is in my opinion a cop out (or just an uneducated technician) which in this case doesnt seem to be the case.
PAPABEAR, since it seems to be related to RPM i'd imagine its valvetrain related, but thats just an educated guess.
my question would be does it seem to be more noticeable in higher/lower gears, when the engine is cold/hot, and when did it start.....
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