Symptom Checks

Perform the following:

• Perform QUICK TEST. See TESTS W/CODES - EEC-IV (4.0L) article. If code is present, perform appropriate CIRCUIT TEST.
• Check for restricted exhaust system.
• Check for restricted air intake duct.
• Check EGR system. See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS - EEC-IV (4.0L) article.
• Check ignition system. See IGNITION SYSTEMS in appropriate SYSTEM/COMPONENT TESTS - EEC-IV (4.0L) article.
• Check idle speed. See IDLE SPEED & MIXTURE in ADJUSTMENTS - 4.0L article.
• Check engine mechanical condition. Check compression, camshaft, valve train components, etc.
• Ensure transmission is functioning properly.
• Perform CIRCUIT TEST S. See TESTS W/CODES - EEC-IV (4.0L) article.
• If engine stalls during parking maneuvers, check Power Steering Pressure (PSP) switch operation. See step 3) of CIRCUIT TEST FF in TESTS W/CODES - EEC-IV (4.0L) article.
• If engine stalls during transmission engagement, check transmission solenoids. Go to CIRCUIT TEST TC in TESTS W/CODES - EEC-IV (4.0L) article.
• If engine stalls with A/C on, go to step 30) of CIRCUIT TEST KM in TESTS W/CODES - EEC-IV (4.0L) article.