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 throttle linkage and cable

Fuel metering Check air/fuel ratio (02 sensor voltage), refer to COMPUTERIZED ENGINE CONTROLS
Perform injector service (cleaning), refer to MAINTENANCE PROCEDURES
Check fuel pressure (check return hose), refer to FUEL SYSTEM DIAGNOSIS

Incorrect idle speed Check and clean throttle body, refer to MAINTENANCE PROCEDURES