99 Grand Am misfire

[wopsmickey]

Ok I've checked the wires, plugs, coil, manifold, fuel injectors, everything, and I've even had 2 different mechanics look at it and I can't figure out why it' misfires. Cans someone please help me on this I've put way to much money into this POS and I have two more years left until it's payed off.

[jkpacyga]

do you know which cylindar is misfiring? is your check engine light on? the mechanics should have ran a diagonstic check of the system.this is long shot but it maybe your computer going crazy. it happened on my car it wasnt a grandam it was a cavalier never the less it was a GM vehicle. a good diagonstic test would help out. they run about 90 dollars.

[hedder57]

It's the fuel injector sticking or gummed, I'm having the same problem with my Grand Am. I'm running premium gas and injector cleaner that seems to alleviate the problem.