po302

[bearcatdon]

I own a 99 Malibu V6 with 90,000 miles. I’m getting a PO302, cylinder #2 misfire code from the computer and sometimes a PO303 yet the car runs fine except for an occasional hesitation during high acceleration. The light will come on for a week then off for another. I've upped the octane and dumped fuel injector cleaner to no avail. I’ve changed the plugs, wires, verified that the coil has 5.5 k ohms, verified the electrical connectors to the coil and the cylinder has a compression of 160 psi. It also has the dreaded leaky intake gasket. Does anyone have any idea on what can be causing this code?

[teto1977]

my cousin had the same code with a dodge ram van and that it was the misfire at cyl.2,now he had changed the spark plugs and wires and some sensor, but it turned out to be the fuel pump

now i have another friend with an alero with the same code, ive changed the spark plug but dont remember if i changed the boots im still going to give it the tune up and im going to change the fuel filter,but if it continues then ill go ahead and change the fuel pump

[dwalmop]

when you said you have the dreaded intake gasket leak, did you mean it's leaking now??? that could cause a cylinder misfire. Also, if all the other things you tried didn't work I'd look into the injectors.

[bearcatdon]

Shortly after the posting my car started dumping almost a quart of oil/week into my antifreeze so I changed the intake gasket. Once repaired, it ran like a charm.

Teto:
You may want to spend $40.00 on a fuel gauge and verify your pressure to confirm or deny any fuel pump issues. It's cheaper and quicker then changing out a pump.