After a thorough service we cant get the idle speed to be lower than 1000-1200. We have reassembled the throttle body a number of times and also tried 'tricking' the ECU but it still brings the revs up to 1000-1200. This tells us the computer thinks it needs to be at those revs. The only other thing done at servicing was a new radiator (old one cracked) so could this be the heat sensor thinking the car is cold constantly? We are at a real loss as there are no warning lights or error messages showing up.