Misses Under Load

Definition: Steady pulsation or jerking that follows engine speed, usually more pronounced as engine load increases. The exhaust has a steady spitting sound at idle or low speed.

POSSIBLE CAUSE ACTION

Contaminated fuel Drain fuel tank and add clean gasoline

Restricted fuel filter/line Replace filter/repair restricted line

Incorrect fuel pressure Check fuel pressure

Plugged fuel injector(s)
Poor injector spray pattern Check fuel injectors