Daughters truck has had this issue since we bought it. Truck runs really well except on cold start the RPM is really high, I'd estimate at least 2500 or more, and this cant be good on a cold engine. it's a stock Hitachi carb with everything hooked up properly and no vacuum leaks etc. Is there an adjustment for the choke on this I'm missing somewhere? I've done some searching and the only thing I'm finding is adjustment of the fast idle cam??? Any help appreciated.