i was just driving down the motorway and looked at the temperture gauge it wa on red then as i came off the motorway the gauge went back to in the middle i got to tesco and turned it off. turned it back on and would only start when i gave it some revs. so i though i better get home so was on way back home down motorway and lorry pulled out so took foot off accelerator and it konked out so i started her back up again with revs and she just started. then as coming off motorway had to stop at lights and it was just reveing itself or if wasnt doing that then it would just cut out. i have just managed to get it home but making a really wierd noise under bonnet any suggestions what may be up with it?