I drive a clio sport 182, iv had no problems until my engine management light started flashing when i was idling or driving at slow speeds, on xmas day the temp needle was dropping then returning to the middle then dropping again. Then i started losing power and i pulled over, the car was revving itself. I turned the engine off, left it for a while then drove off again. Further down the road i lost power again and the engine cut out showing the battery light and the stop light. It wouldnt start again. I left it for a few days and it started working again but the temp needle was still flicking up and down. I took it to 2 garages, both claimed it had stopped doing it. I read that it could be the engine coolant sensor which they replaced for me. Everything was fine until recently the engine management light has been coming on when iv been idling or driving at low speeds in traffic. It usualy comes on about 1 minute after i do this. I don't loose power or notice anything different but im worried something s up. Any ideas?