these few days morn, everytime i start my SP.the idling rpm will siaosiao go up 4!!!darn high.i have to wait a while for it to drop,but sometime it never drop....i hand to tune it to around 1.3 .then next morn it go up to 4 again!! in a very cold morning,i dnt need to pull choke!!just kick 1 times and it go up very high..i go ban hock heng at defu repair( Hw the shop guy??) they say value problem and charge me $60.is its expensive?? Can someone help ??wat the problem with my idling??