ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-12990-823225--1 1096
ROUGH, UNSTABLE, OR INCORRECT IDLE, STALLING
Definition: Engine runs unevenly or rough at idle, also the idle may vary in RPM (called hunt-
ing). Either condition may be severe enough to cause stalling. Engine idles at incorrect
speed.
PRELIMINARY CHECKS
Perform the important preliminary checks as described at the start of the “Troubleshooting Charts”
section.
CHECK FUEL SYSTEM FOR:
1. Open in CKTs 467 or 468.
2. Fuel injector(s) leaking.
CHECK IGNITION SYSTEM FOR:
1. Correct ignition timing.
2. Possible opens in the following circuits, CKTs 424,430 and 423.
3. Possible short to ground in the following circuits, CKTs 430, 424, and 423.
4. Faulty spark plugs, wires, etc.
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