Originally Posted by
badcoupe
What are your long and short term fuel trims? Typically a bit contrary as the ambient temp goes down? If so I?d be looking at intake gaskets, fairly common on those plastic plenums. If your fuel trims are both high in closed loop I?d start there. Also have you cleaned throttle body, and it needs done very well. When it?s dirty and doesn?t close far enough it causes vacuum signal issues with the map sensor due in part to the maps location. If you suspect intake is leaking best way to verify is with a smoke machine if ones available. Also perform a cam-crank relearn. Hopefully this is helpful