My 05 has just started to idle erratically, going up and down, 800 to 1300 and back continuously. Driving me nuts. Has anyone else had this problem? any ideas? I had something similar happen to a non-boosted car and was told it was a vacume leak giving the ecu erratic signals for air flow, so it constantly tries to correct. Thanks....

 

Anyone??? Buehler???? buehler????

 

I have the same problem right now and the only thing I didnt pull apart is the IAC

 

I guess the next step would be a vacume/boost leak test. What is involved with this? I am doubting it is a leak, My boost stays solid in every gear. The only way to check the IAC is to replace....bummer...