mine has never done that. well it did during break in a long time ago but i just turned the idle counter clockwise and it stopped. maybe your throttle trim is set too high? turn that left. my trucks throttle started to stick for a while though way down low on the rpm scale try sticking your finger in there are pushing on where the low speed needle is. to close to slide in the carb. if it dies or stops idling high thats your problem. as for fixing that i just took some wd 40 and sprayed it in there and soaked it untill it loosened up again. no problems since