For 1990-2009 cars

Checks | Actions
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DEFINITION: Steady pulsation or jerking that follows engine speed, usually more pronounced as engine load increases. The exhaust has a steady spitting sound at idle or low speed.
Misfiring Cylinder | Using a scan tool, check for a misfiring cylinder.
Secondary Voltage Components | Check secondary voltage components for corrosion of electronic ignition (EI) module coil towers and spark wire ends.
Spark Plugs | Check spark plugs for cracks, broken insulator or improper gap.
Wire | Check wires for chafes or cuts.
Fuel | Check for low fuel pressure and fuel quality.
Injectors | Perform Injector Balance test to test for clogged injector(s).
Valves | Check for proper valve timing, broken valve springs or sticking valves. Perform Compression test.