GM Repair Problems? Ask GM Repair Expert Now.
Hello, my name is***** is usually caused by the vacuum pump or boost solenoid. Check for good vacuum, from the belt driven vacuum pump at the boost solenoid, on the left hand rocker cover.Check for good vacuum to the waste gate at idle. If vacuum is bad replace pump if not replaceb oost solenoid. Let me know how it goes or if you have more questions. Thanks.