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.

POSSIBLE CAUSE ACTION

Contaminated fuel ^ Check for water or excessive alcohol in fuel
^ Drain fuel tank and add clean fuel.



Lead contamination ^ Check for missing fill pipe restrictor
of catalytic converter ^ Replace catalytic converter if contaminated



Low fuel pressure ^ Check fuel pressure



Pinched or collapsed fuel hose/line ^ Repair/replace as required



Throttle valve not fully opening ^ Check accelerator pedal travel
(Floor mat/carpet interference)
^ Check throttle cable adjustment



Dirty air filter ^ Clean or replace