Hi nova 1.4i runs well but occasionally the engine management light comes on for a couple of seconds and the engine judders as if it could cut out ..but picks up and runs fine again. I only use the car for short journeys up to about 10 miles and this seems to hapen when the engine is warm. I'm a bit concerned it might cut out altogether sometime. now and then it is difficult to start when warm. any help advise would be great TIA