Surge, Hesitation, Stall on Deceleration

Engine hesitates or stumbles on acceleration, sometimes stalling. This condition can occur at any speed, but primarily from a stop. Vehicle may also experience a surge or rise and fall of engine speed at cruise or steady throttle.

POSSIBLE CAUSE
EGR malfunction.
Flange gasket leaking.
Excessive backpressure.
Loose valve.

ACTION
Check EGR system.



POSSIBLE CAUSE
Spark timing.

ACTION
Check spark controls.



POSSIBLE CAUSE
Air management valves.

ACTION
Check air injection system.



POSSIBLE CAUSE
Faulty canister purge.
Liquid fuel in carbon canister.

ACTION
Check evaporative system.



POSSIBLE CAUSE
Ignition timing.

ACTION
See "Computers and Control Systems".



POSSIBLE CAUSE
Restricted exhaust system.

ACTION
Check catalytic converter.



POSSIBLE CAUSE
Poor or contaminated fuel.

ACTION
Recommend higher grade fuel.