right this morning i had a look in a bit more detail what actually happens. when i fire the car up the engine sets itself at 1100rpm as it should, it then gradually rises over about a minute to 1900rpm but then stays there. if i start the car and rev the engine as i fire it up the revs then reset to 1900rpm almost straight away. its like once i rev past 1900rpm the idle then settles at this??