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This could be quite a few things but you will want to start with scanning the system for trouble codes. Most auto parts stores will do this for free. If there are no codes this will have to be looked at by a professional with a good scanner. They will look at actual values from various sensors to determine what is going on. If you prefer to use a shop for this, use this link to find a good one near you. https://repairpal.com/repair-shops Alex