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I have a 2004 GMC Savana 6.0L that has a random misfire P0300 and specific cylinders showing up on the scanner are in cylinder 4 and 6 I can’t figure out.
Things I’ve tried:
-Changed coil packs on the whole passenger bank
-spark plugs
-injectors
-fuel pump (it was pumping kind of low at 50psi)
-wires for coil packs
-fuel filter
-checked fpr voltage and if it’s leaking from vacuum
-maf
-intake filter
-intake gasket
-checked o2 sensors all switching properly it seems
-checked wiring with noid light and multimeterOddly bank 1 is dumping fuel leaning out. Also compression is good in those cylinders. The van only has 42k miles but it sat for a while so I’m not sure where to go from here.
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