Rough Or Rolling Idle, Stalls, Misses, Hesitation Or Surge

NOTE: If the engine stalls after start up, see TEST AC under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (BI-FUEL) article.

Check fuel delivery system. See TEST HC under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (BI-FUEL) article.
Check secondary ignition system. See TEST JB under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
Check exhaust system for restriction. See TEST HF under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
Check PCV system. See TEST HG under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
Check automatic transaxle/transmission operation. See appropriate ELECTRONIC CONTROLS or OVERHAUL article in AUTOMATIC TRANSMISSIONS.
Check EVAP Emission system for blockages (engine stalls) or leaks (excessive fuel odor). See SYSTEM TESTS (EVAPORATIVE EMISSIONS) in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
Check engine mechanical condition. Check compression, camshaft, valve train components, etc. and repair as necessary. See appropriate article in ENGINES.
Check air intake system, see TEST HU under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
Check Mass Air Flow (MAF) sensor and related circuits. See TEST DC under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.
Check for engine surge with cruise control on. Check for engine surge with A/C on. On models with rolling idle and/or engine stumbles when A/C cycles on, check A/C compressor diode. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. If no problems are indicated, return to SYMPTOM DIAGNOSIS to identify any additional symptoms or check for intermittent faults. See TEST Z under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V (GASOLINE) article.