Surging at Idle

[Scarlet2003]

Well, I have changed all plugs and all spark plug wires and the surge is still there. Also tred 89 octane vs. 87 on the vapor lock theory. Still does it. Also tried removing the K&N air filter and replaced it w/ a Purolator paper filter. So far it seems to be ok.... Keeping my fingers crossed....

[CREWZIN]

Did you try cleaning or changing the IAC (Idle Air Controller) in back of and attached to the throttle body?

[Scarlet2003]

I did have the throttle body cleaned a few days ago - would that be part of that service or would I have to ask the Tech to do that?

It is 90 here today and the car is still surging.

[CREWZIN]

It's hard to say from here if they touched the IAC or not. Don't know what else to suggest except to spend some money and have it diagnosed with the latest equipment form a skilled tech. Take whoever you choose for a ride and let them see what's happening.

[slartyblarfast]

Usually surging is a sign of a vacum leak. Also could be a/c compressor on and off. How bad is the surge?

[Scarlet2003]

Slarty - it feels like it about to stall in gear at idle w/ the AC on and is very disconceritng to my wife (her car not mine) especially w/ 2 little kids in the car. The dealer is an idiot. Been there twice and all I get is, "Duh, not throwin' a code". It did not do it all winter (or what passes for winter here in NC).

[slartyblarfast]

Ok.... It only does it with the a/c on? Does it feel like it's chugging and then al of a sudden it idels up fast and then smoothes out? If that's the case then I'm pretty sure that your cooling fan is inoperative. The a/c compressor comes on and the head pressure builds too high, the engine lugs down and the compressor turns off. I'd bet that the a/c also doesn't work real good at idle? It's also probably intermittent?
A dollar to a doughnut that's what the problem is.