Thread: mis fire

2005 grand prix 3.8 misfire changed plugs ,wires,coil packs ,maf sensor was checked also ignition module was checked car still starts sucking down a lot of gas have not drove it only turn it on to see when changes were made if it fixed the problem any help would be great car has been driveing poorly would start the car and it would drive like crap but I would turn it off restart the problem would stop but if I couldn't stop to restart the car if I hit the gas pedal the check engine light would flash and when I would let off the gas it would stop so two days ago car was fine was at a light and all of a sudden car was shaken had no power and sounded weird ??????

A flashing CEL means an active misfire.

Have you had the car scanned to see what codes come up? This is where I would start. Would tell us what cylinder(s) are misfiring. Also, hope you installed either the stock irridium plugs or copper ones. These ignition systems do not work with platinum plugs.

yea it wouldn't say the code was for my stupid gas cap also a vacuum leak and it just said major misfire wouldn't tell us much more we put ac delco plugs I think the copper not sure took it to my regular car place they said that the things I said above in my post were the cause they wanted 200 $ just to replace a coil pack that they were sure that was the cause so we went and bought 3 just to see because we were not sure which one was bad but none of them were so I took them back and got my money so im lost on what to do I just paid this car off