2003 Oldsmobile Silhouette runs rough/hesitates when warming up.

Asked by Jerry Jan 10, 2020 at 06:22 PM about the 2003 Oldsmobile Silhouette

Question type: Maintenance & Repair

Van runs rough/hesitates when it is warming up. Less when it is cold and hot.  It does not code at all.  Catalytic converter and muffler have been replaced.Tried unplugging mass airflow sensor and no difference.Revs in neutral and park just fine. You can give it very little gas when warming while driving.  Once engine is at temp, it only does it when heavy acceleration.

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