Drives @ high speed even when my foot is not on the pedal,cuts speed (it jerks like it cuts off fuel)when I am driving at a low pace. When this has happened it will not pick up speed, no matter which gear I engage. When you shut off the engine for few minutes and restart it the idling is fine, then the problem starts all over again. What causes this and how can i fix ? Been advised that computer box needs replacing. Reluctant coz might I do it only 2 find that the problem persists. Any advice guys ?

Cars & Trucks