Symptom Checks
Perform the following:
- Check ignition system. On models with Distributor Ignition (DI), perform CIRCUIT TEST AA. On 4.0L engine, perform CIRCUIT TEST AC. See TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section.
- Check for restricted exhaust system.
- Check engine mechanical condition. Check compression, camshaft, valve train components, etc.