Possible problems 1-BAD SENSOR-Most likely the manifold pressure sensor. Take car to Advance Auto Zone or Advance Auto Parts and have them scan for trouble codes that might be present.They will tell you if you have a problem code and what it means.They do this check for free. 2-IF YOU DON'T HAVE TROUBLE CODES OR BAD SENSOR-When was the last time you replaced spark plugs,wires,fuel filter,air filter,and pcv valve?All of this can affect the way your car drives.
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