Q&A

 Rookie

Engine starts fine and idles okay, but has no power, economy gage all the way in red, doesn't shift properly. Does not straighten out even after up to normal temp unless engine is shut off and restarted. Can restart after driving a short distance, and everything runs fine, economy gage in green, plently of power, shifts normally. Subsequent restarts even after a couple hours, everything works fine, but that first cold start. Happens every morning and problem never goes away until it's shut off and restarted.
Where do I look? Temp sensor? O2 sensor? Some vacuum control? EGR? How to diagnose problem?