Rough/Unstable Idle or 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

Throttle linkage sticking/binding Check and adjust
Proceed to ADJUSTMENT PROCEDURE

Fuel Injected Check air/fuel ratio,
SEE COMPUTERS AND CONTROL SYSTEMSComputers and Control Systems

Check fuel pressure,
(check vacuum line and return hose)

Incorrect idle speed Check and adjust
Proceed to ADJUSTMENT PROCEDURES