Idle problem

[Codered]

So today I started my 92 fox body mustang and the car wont stay idling the rpm needle jumps up and down then the car dies out and has a hard time starting back up with little gas is there anyone that ran into this problem I already change the tps any help would be nice

[91CoupeMike]

Maf?

[Codered]

Maf is new also change the air charge sensor and it it still does the same thing

[FoxBodyNick]

Iacv?

[JC316]

Idle air control or engine coolant sensor I would say.

[Codered]

Just change the engine coolant sensor and still has the same problem

[JC316]

IAC valve it is then.

[Codered]

IAC is new and install still no fix

[mk5.0]

Vaccum leak .

[Codered]

check the vaccums no leak anywere

[Big A]

Is the A/C on when you try to start the car? I had an issue in my '98 where it would idle fine with the A/C off, but would hunt for idle and die as soon as I turned the A/C on. Turned out to be a vaccuum leak in the vent acctuator line, that only caused an issue when the A/C was on.

I'd double and triple check for vaccuum leaks again, it's easy to miss something. How exactly are you checking for leaks?