mis-fire problem

[BIGDAN230]

I've had a problem with cylinders 1-2-3 mis-firing and can't find the problem. I've changed the coil packs,plugs,tps sensor,changed all vaccum hoses to silicon,crank sensor,and still have the problem.Oh and bye the way it all started after i started to use the Pro-M MAF.coincedence?maybe but the OBD II only gives us hints and im going broke trying to figure this out if anyone can help give me your advise or recommendations.Thanks

[X-ception]

did you try putting your stock maf back on?

[BIGDAN230]

Yes.The day the SES light came on.

[PontiacGT2K]

You've changed everything that may be the culprit, other than wires of course. Or you might have accidentally disconnected the harness on your purge valve canister? Both would cause problems...

[jaketuff]

Originally posted by BIGDAN230
I've had a problem with cylinders 1-2-3 mis-firing and can't find the problem. I've changed the coil packs,plugs,tps sensor,changed all vaccum hoses to silicon,crank sensor,and still have the problem.Oh and bye the way it all started after i started to use the Pro-M MAF.coincedence?maybe but the OBD II only gives us hints and im going broke trying to figure this out if anyone can help give me your advise or recommendations.Thanks

Bearing in mind that you put the stock MAF back on and let the PCM reset and so forth...

Then it seems that the Pro-M is likely the issue. Was the meter calibrated for your model year PCM... ? That may create a conflict. It seems very peculiar b/c you can swap any year MAF on any year car w/o codes from what I have seen. However, the Pro-M is tuned so perfectly that it may require you to have a certain PCM model year. Call them let them know what's up... let us know the response....

JOUT

[shawn2ktats]

Originally posted by BIGDAN230
I've had a problem with cylinders 1-2-3 mis-firing and can't find the problem. I've changed the coil packs,plugs,tps sensor,changed all vaccum hoses to silicon,crank sensor,and still have the problem.Oh and bye the way it all started after i started to use the Pro-M MAF.coincedence?maybe but the OBD II only gives us hints and im going broke trying to figure this out if anyone can help give me your advise or recommendations.Thanks
mine is doing the same thing right now,ive changed everything and still misfires not bad but enough,i havent done any mods lately that would make it do that:confused:

[PGsGT]

Bad injectors will make the car misfire also. I doubt that all 3 of those would be going bad though - especially on a newer car. Try running some cleaner through the tank:)

[BIGDAN230]

Ok guys I found the problem!!! I replaced my cone filter 2 weeks ago so I didn't think to bother checking it but of course with all the heavy rain fall i've been getting up here the filter got wet and clogged up with debris and mud.So sorry for wasting everyones time and THANKS!!!

[IanGT99]

Ah, man, I really hate it when that happens. It's always the simplest reason and you never think to check it out til later. I've done that a few times with various things and then proceeded to kick myself in the @$$...lol. Mine misfires for a few minutes after I start up, but I need new wires badly. Glad to hear everything's ok!