Engine Sputtering in Idle
So My '11 WRX has been sputtering while in idle for the last few months, its almost like its barely about to stall then comes back to life. It doesnt do it all the time either. At first I just thought it was my A/C because that it when I noticed it the most. Today however, on my drive to work it happened a few times with out the air, then bang in the middle of it happening the CLE, TCS, and Cruise came on! LIMP MODE! All I Have done to her is put an Invidia Q300 on. Anyone have any ideas? I have an appointment with the dealership to get it checked out but just though I would ask if anyone has experinced this. thanks for any help!