Hello all My VN has been running all good....till this morning....doesn't like the cold . It tends to stall/hesitate asap you press the throttle a bit. Do we need to install a new air temperature sensor?. Oil I'm using is 20/50. It's got great acceleration,but I've noticed the idle I'd on occassions irratic...yes I've installed new IAC motor,new TPS,new leads and plugs, pcv valve all cleaned up. Just found out its got a power chip memcal....are they good or ##!@. I do have caused and sports exhaust. One at a time....idle issues/, hesitate...anyone experienced the same....if so what's the cause and fix please. Thanking you all in advance for your help!!!!