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random misfire 03 supercharged 3.3L manual

273 Views 5 Replies 5 Participants Last post by  Blackberry
I have misfire issue, I've changed distributor, the cap & rotor, knocking sensor, spark plugs & wires, timing belt d and still does the same thing...what could it be??
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Besides the things you mentioned, I’ve seen:

clogged fuel filter
Fuel sending unit corrosion
Blown out supercharger gasket(this should have been replaced when the knocking sensor was replaced)
Supercharger bypass valve leak
Clogged converters
Fuel pressure regulator
Water in fuel
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This is why the service manual calls the P0300 “Multiple cylinder misfire” and not “Random cylinder misfire”. There’s usually nothing random about it
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