Hesitation, Sag, Stumble: Notes
DEFINITION:
Involves a momentary lack of response as the accelerator is pushed down. This can occur at any vehicle speed. It is usually the most severe when first trying to make the vehicle move, as from a stop. Hesitation, sag, or stumble may cause the engine to stall if severe enough.
CAUTION:
Before diagnosing this condition, check service bulletins for Programmable Read-Only Memory (PROM) updates.