Hesitation Momentary lack of response as accelerator is pressed. Can occur at all speeds. Usually most severe when starting from a stop. May cause engine to stall. Missing Pulsation or jerking that changes with engine speed.
Exhaust has a steady spitting sound at idle or low speed.
Not normally felt above 30 mph. Rough idle Engine runs unevenly at idle. Car may also shake. Sluggish Engine delivers limited power under load or at high speed. Won't accelerate as fast as normal.