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Like the choke is out on an older car. When warmed up it rises then falls then rises and falls etc. Any ideas. I've just had the capacitors replaced on my ecu so could this be a case of re learning? Had it out for a run in mixed traffic for about 20 mins. "reset" by pulling the fuse, but assuming they made a good job of replacing the caps and checking for damage on the tracks in the ECU and you don't have a vac hose leak somewhere, it could well be a sticky ICV on the throttle body as these can get gummed up over time. With the throttle body off it's also much easier to check and if necessary adjust the TPS as per the book. It normally fixes itself after the engine is fully warmed up so i'm assuming moisture is getting in somewhere and then drying out. But thats only when its warm. When it starts from cold its just high idling all the time. Weird! A little search mentions that it could be air trapped in the coolant system so ill have to try bleeding it as one possible solution. Ah the joys!£15 and 5 minutes to replace but made a world of difference on my previous rev 2 turbo which used to cut out when I dipped the clutch.