Well about two weeks ago my car went from a smooth idle to the way it idles when the ac is on full. It revs up a bit drops down and clicks, sounding like the ac, and revs back up again. It does this continually. Any ideas of what it could be?

 

IACV?

 

yeah cleaning that thing does wonders sometimes, start with that

 

Clean the IACV (Or replace it, if your budget allows), and try bleeding the coolant. It's possible you have air trapped in the system.

I had the same problem after we put my Y8 manifold on... Bled the coolant, and it's not an issue anymore.

 

Wait.. this is old but.. can you remind me what IACV means?

 

Idle air control valve

 

I was one word off. Go figure. Hopefully that takes care of it then.