Quote:
Originally Posted by someday31
I have an 03 1500 silverado, 125000 miles, 5.3V8..... this morning once started it ran real rough, erratic idle, my check engine light flickered many times, but didnt stay on. I checked the codes after driving 25 miles and it had a p0300...which looks like multiple cylinder random misfire......so what to do? Plus are ac delco iridiums, changed about 50,000miles ago, new wires then as well.....
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check the fuel pressure should be 53-62psi. could be iced up fuel in tank / filter especially if you keep fuel level low in the tank .
need scan tool to reset this code . engine running poorly will create this code as the cam gets jolted ..