mustang4eva

Hello guys, yes I am aware of the amount of these coming in, but none seem to describe my problem I think, so here goes. My idle seems to be great at 700 until the motor warms up a little. Then it jumps around a bit. But the wierd part is when it jumps, my battery guage jumps up significantly also... Like there one and the same problems. Im sure this is minor but how should I aproach fixing it? Thx Alot!

90GTRagtop

If the idle is jumping up and the battery goes up as well, it's probably that the increased speed is allowing the alternator to make the proper voltage. If that is the case, I would expect that when you speed up the motor with the accelerator, the voltage would go up as well. If that's the case, I'd suggest looking at the normal idle issues, sticking or dirty IAC valve, MAF sensor, etc.

tchamber

Does the check engine light turn on?