Symptom Definition

Momentary lack of response when accelerator is pushed down. Can occur at any vehicle speed. Usually occurs when taking off from a stop.

Possible Cause & Correction Check the following:

• Visually check vacuum hoses for splits, kinks and proper connections, as shown on Vehicle Emission Control Information label.
• Check ignition wires for cracking, hardness and proper connections at both distributor cap and spark plugs.
• Check wires for pinches, cuts, and proper connections.
• Ensure fuel pressure is correct in all speed ranges. Also check for poor fuel quality or water contaminated fuel.
• Check for fouled spark plugs.
• Ensure correct PROM is installed in vehicle. Check with dealer for latest application information.
• Check for a binding or sticking TPS.
• Ensure initial ignition timing is properly set.
• Ensure ECM controlled idle speed is correct.
• Check EGR system for proper operation.
• Disconnect fuel injector electrical connectors. Crank engine and check for injector leaks.
• Check for an open in HEI ground circuit.
• Check canister purge system for proper operation.
• Check charging system output. Repair charging system if voltage is less than 9 volts or more than 16 volts.