This one is for you Stihl guys. I have a MS210C that won't idle for ****. I took the original carb apart and soaked it for a week in carb cleaner. Put it back together and the saw just doesn't idle right no matter what I do to it. It revs up great and WOT is fine. When idleing it the revs go up and down slightly and it makes the chain spin. The motor is running like it is in a loping mode. If I lower the rpm's it stalls. I picked up a China carb and have the same issue with that carb. Turning the H and L screws does affect the saw running with either carb installed. Could it be an air leak? If I bring the rpm's up off idle the saw runs great but the chain is also spinning.