So I just had my car at mitsu to get a gasket replaced that was leaking coolant, and after getting it back, when I turn on the a/c while the car is stopped, the revs will bounce back and forth between about 600 and 900 rpm ( a lot of people told me this is normal when the compressor turns on, but its different, when the compressor turns on the revs jump for a second, and come back down, this just bounces back and forth)

Any idea what this could be?

 

Does your intake have a shield around it? If not that is what's causing the rough idle. The ac fan is blowing air into the MAF.

 

O... no haha, but why hasn't this ever happened before? Has it just not been hot enough out till today?

Also does anyoen have an idea where to get a heat shield for a cobb sf intake? Doesn't come with one...