Hesitation, Sag Or Stumble

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 Isuzu VehiCROSS, 2000 Isuzu Trooper, 2000 Isuzu Rodeo, 2000 Isuzu Hombre, and 2000 Isuzu Amigo. 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 do to torque converter drain. For correction of symptom, refer to appropriate article in AUTOMATIC TRANSMISSIONS.

Check for faulty O2S.
Check fuel pressure.
Check for contaminated fuel.
Check for binding 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 MAP sensor operation (if equipped).
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 canister purge system.
Check EGR system.
Check for faulty TP sensor.
Check fuel injectors. Perform 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 for proper PCM grounding.
Check for faulty MAF connections.
Check air induction system for restrictions.
Check for intake valve deposits.
Check for faulty vacuum lines.