Idle surge problem and misfiring

[98gst14b]

Wether the engine is hot or cold itll just bounce up n down forever, and at about 3500 rps it sounds like its missfireing, dtc's show barometric pressure but I dont see a map sensor anywhere, I dont think my car has an egr valve maybe it could be the iac? Where is it located? Anything else I should check? Thanks

 

[98gst14b]

So could it be my maf thats bad? Since I have a chipped ecu should I just switch to a 2g mas and get a safc or get a replacement gm mas? what do you think?

 

[oldman]

You can start by replacing the MAF sensor. There's a listing in this thread that you can bring with you to a junkyard so that you can find a suitable replacement on the cheap:

http://www.dsmtuners.com/forums/showthread.php?t=174055

If you insist on a new sensor, you can find these at:

http://www.dejonpowerhouse.com

Thank god I read the whole thread before I posted, I can't believe how many people missed it.

 

[98gst14b]

SOLUTION: Bad maf, replaced. and a very small leak in intake manifold gasket.