Multi cylinder misfire
2004 Pontiac grand am 6cyl has a
miss on start up but seems to go
away after driving for 300 yards.
Don’t notice any loss of power or
anything else when at highway
speeds. Check engine light on. Code
just says multi cylinder miss. I’m
If the CEL is on, you have misfires even after the engine warms; you just don't feel them. You have to diagnose this and fix it or you could damage the catalytic converter. Misfires aren't that difficult; it's a fifteen year old car, so it's probably just coils, plugs, ignition wires.
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