Possible Cause & Correction

Check the following items:

• Ensure air filter and fuel filter are not plugged. Replace if necessary. Check for incorrect fuel pressure. Also check for contaminated fuel.
• Check shift solenoid system and Torque Converter Clutch (TCC) system for proper operation.
• Check Knock Sensor (KS) system for excessive retard.
• Check ignition control system for proper operation.
• Check the spark plugs.
• Check the fuel pressure. See FUEL SYSTEM PRESSURE TEST under BASIC FUEL SYSTEM CHECKS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
• Check for plugged injectors. Perform injector balance test. See FUEL INJECTOR BALANCE TEST under FUEL SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
• Ensure EGR valve is not open all the time.
• Check exhaust system for restrictions, such as a damaged or collapsed pipe, muffler or catalytic converter.
• Check charging system output. Repair charging system if voltage is less than 9 volts or more than 16 volts.
• Check for A/C clutch cutout at Wide Open Throttle (WOT).
• Check Manifold Absolute Pressure (MAP) sensor.
• Using Spark Tester (J-26792), check for available secondary voltage.
• Check air induction system for restrictions or air leaks.
• Ensure the installed PCM program is correct for the particular vehicle. Check with dealer for latest application information.
• Check engine compression. Check for incorrect valve timing, bent push rods, broken valve springs or worn camshaft lobes.
• Check for excessive fuel additives.
• Check for binding accelerator cable.
• Check engine supercharger (if equipped).
• Check if engine is operating in torque management mode (if equipped).
• Check boost control system components and connections (if equipped).
• Check for proper operation of the Transmission Fluid Pressure (TFP) manual valve switch.
• Check PCM and engine grounds for correct locations, tight and clean connections. See WIRING DIAGRAMS article.