If your vehicle is showing car jerks, bucks, or surges while driving at a steady speed, here are the most likely causes and the parts you'll need to fix each one.
Worn spark plugs, failing ignition coils, or degraded plug wires can cause the engine to misfire. This often feels like a sharp jerk or bucking sensation while maintaining a steady cruising speed.
The MAF sensor measures air entering the engine. If it is dirty or failing, it sends incorrect data to the computer, causing the air-fuel mixture to fluctuate and the engine to surge.
A cracked hose or leaking gasket allows unmetered air into the engine. This leans out the air-fuel mixture, causing the engine to surge or hesitate at steady speeds.
A clogged fuel filter or a weakening fuel pump struggles to maintain consistent fuel pressure. This starvation can cause the vehicle to buck or hesitate when driving at a steady speed.
Carbon buildup in the throttle body or a Throttle Position Sensor with a 'dead spot' can cause erratic airflow control, leading to surging at specific pedal positions.
Degraded transmission fluid or a failing torque converter clutch can cause a rapid vibration or jerking sensation that feels like driving over rumble strips, typically between 35-50 mph.
The Exhaust Gas Recirculation (EGR) valve can stick open due to carbon buildup, introducing too much exhaust gas into the intake and causing a lean misfire or bucking at cruising speeds.