Whenever I turn on the A/C, the RPM's starts to move up and down while I'm at a stop. The fluctuation in RPM is large enough to make the car jump forward if I don't firmly press the brakes. I tried turning the car off and turning it back on, but the problem still persisted. Has anyone experienced this with their IS? Any recommendations as to what the problem may be?

Thanks!

 

maybe I posted this a little too late last night, but bumping this up. no one has ANY ideas as to why this is occurring?

 

check all your connectors and take it to an auto parts shop for a quick free diagnostic

 

i have noticed this with mine but got the tsib done for the carbon build up and mine has not done it in awhile. I used to turn on my A/c and the same symptoms occurred for me.

 

yeahp same here its weird.

 

mine does it every now and then (350) but only when its only been running for about 30 seconds. It goes away after that.

 

same here. 08' 250 i just turned the a/c off then back on. Seemed to fix it while the car remained on.