Warning lights intermittant fault

Intermittent fault whilst driving, engine light comes on, sometimes engine management light as well, also at times battery light on with the others. Car splutters, lasts for a few seconds and then all warning lights go out and car runs fine. When this started took to garage and scanned no fault code listed, returned over the next week 4 more times, scanned each time and still no codes listed in pending or fault codes.Oil and water checked by garage each time. Even had mechanics with me on test drive, car ran without fault showing. Any advice would be appreciated.