Do you have a check engine light and when was last tune-up??
Refer to this link: http://www.2carpros.com/articles/engine-surges
Could be one of the following below -check and test:
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
Fuel pressure regulator leaking or defective fuel pump.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.
Tuesday, August 9th, 2011 AT 8:43 PM