Heff

I have a 99 gt that sputters/misses when i give it more than 1/4 throttle at below 2000 rpm, I know this could probably be alot of things and I'll probably end up taking it to the shop next week, but any ideas?

Phirantes

Yeah, have your coil over plugs checked. I have a 99 GT and the intake bursted on me and it continously kept water on my spark plugs causing three of my COP to stop working (ie: three cylinders were not firing). Mine would shudder especially bad when it was in fifth gear and any gas was applied.

Hope this helps

Heff

I had the dealership check it out, and they replaced one of the coils, but it didn't make a difference, and at $250 for one I would be hesitant to replace the other seven.

ottos

Try my post here: https://mustangforums.com/m_4511996/tm.htm

joshafmil

mine is in the shop right now, it does the same thing, but at idle... they just told me a few min ago, its my Idler control valve... so im having it replaced. its about a 350$ install parts+labor... i guess it got clogged/dirty. they said the used to be able to clean them, but they are made so small now that they cant.

99BlackPonyGT

omg you just got raped!!!!!!!! my car wouldnt barely run, it would die getting off freeways etc...i pulled if off and sprayed it with carb cleaner and slapped it back on... the car runs perfect now, and it took 10 minutes!!! even a new IAC is onyl like 50 bucks.....omg....ive never heard of such ownage....thats like the woman whos alternator went bad and a shop told her she needs a new engine!

New IAC
+
Carb Cleaner

in all thats like 60 bucks after tax......