Hesitation, Sag Or Stumble

WARNING: This page is about a different car, the 2002 Isuzu Trooper, 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: On some automatic transmissions hesitation may occur when first put in gear, after vehicle has not been running for a prolonged period of time. This is due to torque converter drain. For correction of symptom, refer to appropriate article in AUTOMATIC TRANSMISSIONS.

Perform On-Board Diagnostic II System Check.
Perform Electronic Throttle Control (ETC) System Check.
Check for faulty Heated Oxygen Sensor (HO2S).
Check fuel pressure.
Check for contaminated fuel.
Check for binding Throttle Position (TP) sensor.
Check ignition timing.
Ensure the installed PROM and/or PCM is correct for that particular vehicle. Check with dealer for latest application information.
Check Manifold Absolute Pressure (MAP) sensor operation.
Ensure charging system voltage is correct.
Ensure ignition system is properly grounded.
Ensure PCM-controlled idle speed is correct.
Check for faulty spark plugs or wires.
Check EVAP canister purge system.
Check EGR system.
Check for faulty TP sensor.
Check fuel injectors. Perform FUEL INJECTOR BALANCE TEST in SYSTEM & COMPONENT TESTING article.
Check injector harness locations. Ensure injectors are connected to correct injector/cylinder according to firing order.
Check PCM power and grounds.
Check for faulty Mass Air Flow (MAF) sensor connections.
Check air induction system for restrictions.
Check for intake valve deposits.
Check for faulty vacuum lines.