ploblem when running in high speed above 50 mph my check engine will light up. code p0300. 4 cylinder i replace all sparkplug and cable no help, replaced both coil no help. engine running great in backup mode. i'm getting 25 mph in backup mode. need help
s-10 1997 multiple missfire
Dec 21, 2004
3 Replies
Need to change fuel filter and check fuel pressure.
Doc
Did you put GM plug wires on? If not do so... Aftermarkets are not good..
Alan
Sure they are. I prefer Accel wires over Delco for performance reasons.
Doc
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