2004 mustang hesitation

[ThirdgenTa]

It's auto

 

[Dasfinc]

Do these still have IAC's on them? I know I've seen a couple of Dirty/jammed IAC issues cause weird hesitation/stumbling and not trigger a CEL.

 

[ThirdgenTa]

Do these still have IAC's on them? I know I've seen a couple of Dirty/jammed IAC issues cause weird hesitation/stumbling and not trigger a CEL.

Yes. I cleaned it already.

 

[blakbearddelite]

I'd put good money on it that there is at least one bad coil.

 

[Tim]

It's auto

What color? If white, the best solution is to sell to me then.

 

[ThirdgenTa]

What color? If white, the best solution is to sell to me then.

Grey.

If it were one of the coils wouldn't it have a rough idle? It only does this when you are driving and give it a little gas. Give it more gas and it goes away.
Any way to test it? I would rather not guess and drop $200-$400 on coils and be back to square one.

 

[boostedguy05]

It's auto

o really, i thought all mach 1's were manual.

 

[blakbearddelite]

Grey.

If it were one of the coils wouldn't it have a rough idle? It only does this when you are driving and give it a little gas. Give it more gas and it goes away.
Any way to test it? I would rather not guess and drop $200-$400 on coils and be back to square one.

When mine had some bad coils, it idled just fine. It also seemed to go away when just giving it a little throttle, but would come right back.

Testing it is the tough part. I was told that the only way to test it was to replace one at a time and see if it went away. Or maybe replace them all and then start putting the old ones back in one at a time. If the hesitation comes back, you know that plug is no good. It would be nice if there was an electric way to test the coil and see if it doesn’t have the same output as a normal coil.

At the time, I was at a Mustang shop out of state and he said it would cost me more in dyno time than it would to replace all 8 coils. But since the car is in your possession at home, you don’t have to consider that.