Loss of Power in Cold Start
New member here. I need some help.
Car: 2007 Pontiac G6 3.5V6
Problem: Engine rpm drops below 1000 rpm in cold start. Engine almost stalls. During this time, engine has no power. Power returns to normal once engine warms up. Changed Mass Air Flow sensor and cleaned throttle body/valve but problem remains. This problem only happens in cold mornings after the car has been parked overnight. Engine should rev higher than normal in cold temperature, not lower. I am totally frustrated. Any thought?
Thanks in advance!