Cylinder 3 misfire on my 2002 Pontiac Grand Prix Gt
I keep having a cylinder 3misfire I've changed all
the coil packs, spark plugs&wires, maf sensor, map
sensor, egr valve, as well as Icm. Is it anything else
I can check out?
How is old is the valve cover gasket? I would also perform a cylinder pressure test to determine if there is a worn valve or piston.
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