[Caric]

I have noticed that when I driving with AC on if I come to a stop it dies. Even if I turn it on at idle it will die after a few moments with idle going rough. I think started to see it happen when driving, I can down shift and the car dies right away then it roll starts itself back up so I have stopped using AC any ideas on what can cause this?!?

 

[titan2782]

Need to replace the IAC valve. Easy fix, 10 minute job and about $30 part.

 

[blackbird_R/T]

It does sound like it could be the idle air control (IAC) pintle/valve. I'd start with removing and carefully cleaning, also checking the wiring as the have been known to have the wiring break inside the pin of the connector (similar to the throttle position sensor (TPS)). Also might want to take a look at the vacuum harness to make sure nothing is leaking and the intake manifold hasn't given out which can cause issues with the manifold absolute pressure (MAP) sensor to read incorrectly and command an incorrect IAC opening value.

One other thing, is the compressor for the air conditioner making any loud noises, banging or clunking when the compressor's clutch engages and disengages? Although they're pretty robust and don't seem to have a high failure rate if the clutch isn't working correctly and disengaging when the computer is expecting it to be disengaged it might cause the engine to bog down. Probably not very likely and if it sounds like it's working normal under regular operation you almost certainly have another issue like the IAC or vacuum leak.

 

[Caric]

Will try the IAC. Looked up price and it's like $80-$100 for it most stores around here. Did find it on rockauto for a lot less.
I tried a smoke test took hose off of PCV and blew smoke through it. Only smoke was right at the IAC

 

[Slowryd]

Will try the IAC. Looked up price and it's like $80-$100 for it most stores around here. Did find it on rockauto for a lot less.
I tried a smoke test took hose off of PCV and blew smoke through it. Only smoke was right at the IAC

It's not worth it if it's aftermarket. You can find a Mopar one cheaper online, just will take a few days to get it.

 

[titan2782]

You can try to clean it first, but I've never had any luck cleaning them. It might work for you though and save you some $

 

[SER-ious]

You can just unplug it also to see of that solves the problem. Talking about the IAC

 

[Caric]

OK so I wanted to update. Turns out it was the cams. Between the head work and the agressive cams it just didn't want to work with the AC on

 

[Laylo104]

You can just unplug it also to see of that solves the problem. Talking about the IAC

What would unplugging it do?

 

[AlmightyFork]

What would unplugging it do?

Stops it from rerouting air around the throttle plate to prevent the vehicle from stalling. I doubt it would fix this (stalling would likely be worse, unplugging the IAC can reduce the symptoms of a vacuum leak). If aggressive headwork was done, he's probably lacking vacuum at idle. The solution probably resides in a part like this - Rhoads Lash Adjusters, 2.0L & 2.4L DOHC (for use w/ large cams)