Had my car in for a map at the weekend, made 405bhp...I'm not at the desired figure yet, any way, I went for a damn good thrash last night, and after a high speed run 150mph plus (private road of course....) it has starter to idle quite high, and then it will change it's mind and idle so low it feels like it's going to cut out! Any ways Iv tried the old turning it on and off again trick and that hasn't work, so what will be the best things to look at first myself before having to take it to a garage etc? Any ideas guys? Thanks
Gtir Motorsport club