Lack of Power/Sluggish/Spongy/Stumble

Definition: Engine delivers less than expected power. Little or no increase in speed when accelerator pedal is pushed down part way.

^ Compare customer's car to similar unit. Make sure the customer's car has an actual problem.
^ Remove air cleaner and check air filter for dirt, or for being plugged. Replace as necessary.
^ Check ignition timing. See Emission Control Information label.
^ Check for restricted fuel filter, contaminated fuel or improper fuel pressure. See CHART A-7. Related Tests, Information and Procedures
^ Check EGR operation for being open or partly open all the time - See Chart C-7. Chart C-7 Exhaust Gas Recirculation Check
^ Check for an exhaust system restriction:
^ Inspect exhaust system for damaged or collapsed pipes.
^ Inspect muffler for heat distress or possible internal failure.
^ Check generator output voltage. Repair if less than 9 or more than 16 volts.
^ Check engine valve timing and compression.
^ Check engine for proper or worn camshaft.