mike08

Couple problems with the mustang

1. on SOME cold start-ups the car will hesitate hard and have a really rough idle. The car idles at right above 500 and the rpm's will lope up and down, eventually the car will die.

2. sometimes the car will miss at idle and then go away leading me to believe that it is not a COP.

3. After hard acceleration, i will put the car in neutral and coast to a stop. most times the car will die afterwards.

Any suggestions for any of the problems listed would be a big help guys. Thanks in advance.

vanquish

IAC valve

bopiela

^ +1 vanquish

mike08

alright ill try it out

Pubydingus

try replacing your fuel filter?

99BlackPonyGT

definately IAC

although, fuel filter should be done every 3 oil changes anyways, so it cant hurt to replace that also

99GTvert

Your car is sniper tuned...what is the current idle rpm's set at? On my car, it would also die on me sometimes when I'm in neutral, but replacing the IAC helped a little bit, but then my car was dyno tuned and I noticed the idle rpm was raised to about 1k. The car's rpms would still drop sometimes, but it doesn't completely die out on me nearly as much.

devongarver

Yup I'll hop on the IAC boat too. And definately replace the fuel filter if you havent in the last 10-15kmiles.

Frostbitten

ill just say its something with the air intake

99BlackPonyGT

ill just say its something with the intake of air