'99 Malibu with frustrating Misfire Code - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-06-2013, 01:11 AM   #1
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Default '99 Malibu with frustrating Misfire Code

We've replaced coil packs, wires, plugs.... vehicle idles beautifully, runs great, accelerates nicely. There is no sign of oil/water mixing and no other symptoms, but we continue to get a Random Misfire (P0300) code. What gives?
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Old 01-06-2013, 11:29 AM   #2
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check fuel pressure and sniff the vacuum line for fuel on the fuel pressure reg.

which engine?
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Old 01-06-2013, 05:04 PM   #3
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Ah, just discovered it'* losing coolant....therefore, I've got a bad intake gasket somewhere. But still engine is running fine (for now).
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