Rough, Unstable or Incorrect Idle; Stalling

Definition: The engine runs unevenly at idle. If bad enough, the vehicle may shake. Also, the idle may vary in rpm. Either condition may be severe enough to cause stalling. Engine idles at incorrect speed.

POSSIBLE CAUSE ACTION

Poor or contaminated fuel Drain fuel tank and fill with clean gasoline

Incorrect air/fuel ratio Check air/fuel ratio

Incorrect fuel pressure Check Fuel Pressure Regulator

Incorrect idle speed Check and adjust