Hi ive got a saff 4x4 cossie on a J reg. Its got a stage 2 chip,greens. When i start the car up from cold it runs ok but as soon as i start to drive the car,it goes on its own without touching the Throttle pedal. It feels as if the choke is on. I drove to work this morning(it was really cold/frost) and it started doing it. On the way home from work it was fine. Has anyone had this fault before. Any help would be nice.