Possible Cause & Correction

Check the following items:

• Visually check vacuum hoses for splits, kinks and proper connections as shown on Vehicle Emission Control Information label.
• Ensure Transaxle Range (TR) switch is properly adjusted.
• Check for intermittent open or short to ground in Torque Converter Clutch (TCC) circuit.
• Check canister purge system for proper operation.
• Check ignition control system for proper operation.
• Check EGR system for proper operation.
• Ensure the installed PROM is correct for that particular vehicle. Check with dealer for latest application information.
• Check for adequate ignition voltage output using Spark Tester (ST-125).
• Check oxygen sensor for contamination. This will cause a false high voltage signal to PCM. PCM will respond by leaning air/fuel ratio.
• Check in-line fuel filter, and replace if dirty or clogged.
• Check fuel pressure while condition exists.
• Check for poor quality or water contaminated fuel.
• Remove spark plugs and check for wet plugs, cracks, improper gap, burned electrodes or heavy carbon deposits. Also, check condition of distributor cap, rotor and spark plug wires.
• Check charging system output. Repair charging system if voltage is less than 9 volts or more than 17 volts.
• Check A/C for excessive charge.
• Check for restricted exhaust system.
• Check injector harness locations. Ensure injectors are connected to correct injector/cylinder according to firing order.
• Ensure driver understands operation of TCC and A/C. See owner's manual.
• Check speedometer calibration.
• Check for rich or lean conditions. Drive vehicle at speed when complaint occurs.
• Check for plugged injectors. Perform INJECTOR BALANCE TEST in SYSTEM/COMPONENT TESTS article.
• Ensure PCM grounds are clean and tight.
• Check for excessive use of additives in fuel.
• Check distributor vent system (if equipped).