BradTank

It's clear when I shut the AC off, the idle becomes rougher. It's not extreme, but you can clearly feel more vibrations through the steering wheel and seat. It's not throwing any codes.

I cleaned the throttle body a few months ago, so I don't think the issue is there. My first guess is the IAC valve, but wanted to see if anyone had a similar issue?

Thanks

2GSKaizen

iTrader: (1)

Ok thats a little strange. It is usually the exact opposite. A/C kicks on, idle drops, and vibrations increase. That is a situation that would make me lean toward and IAC valve. Those 430's usually run so incredibly smooth, I'm thinking you might have something else going on. How many miles?, Changed your PCV valve? tune up recently?

Lavrishevo

iTrader: (1)

Or dirty throttle body.

MDSC

iTrader: (3)

Ac turned on car idles up slightly , what you feeling is worn out motor mounts . If you in drive stoped with a/c off try shifting into netrual if vibrations go away its def mounts