Hi and thanks for allowing us to post our questions. We have a Hyundai Tucson and have always kept up to date on the regular services, however a month or so after our last service it started playing up. The car when stopped at lights surges up to 2000 rpm. This happens intermittently. We have taken the car back to Hyundai twice and they say "they can't find anything wrong!". There is definitely something wrong. The sudden increase in the idle whilst stationary is very noticeable. Any thoughts on what the reason behind this could be? Hyundai seem to have put it in the not worth there time or care basket. Thanks again :-)