Just drove to a nice Indian restaurant. Dined royally. Yum-Yum Got into car, orange engine light on. Running very lumpily Drive the 2 miles home. Tickover very patchy / hunting at lights, etc. On drive, turned off ignition. Pulled out key. Counted to 10. Started car. Alles in ordnung. No lights, ticks over sweetly. Any ideas please chaps?