well after nearly six months of trouble i think the final piece of my car troubles have been solved........ my car was running well rough so i had a new maf 4 new coil packs 4 new platinum plugs a new n75v and after each new part it got slightly better but i was still having errorcode 17705 come up and there was hesitation in the acceleration they someone pointed out something to me that is now so obvious , when i had my forge tip fitted it pushed my DV higher and this meant that the pipe to the top of my DV was a tight fit as it was to short and so was kinked ......changed the pipe and the car runs like a dream so am well happy hope it stays ok