Preliminary Checks
WARNING: This page is about a different car, the 2002 Ford Pickup and 2002 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Check for vacuum leaks. Check air intake duct and air filter. Check ignition wiring. Check alternate fuel tank(s) for adequate CNG or LPG level. Check wiring harness connector for poor connections. Check PCM, compuvalve, sensors and actuators for damage. Check engine coolant for proper level and mixture. Check A/T fluid for proper level and quality. Make all repairs before performing SYMPTOM DIAGNOSIS .