I mean when you put it in 1st gear and take off, get between 1000 and 1500 rpm and it will flutter, hesitate,jerk until you get past 1500 rpm and you are fine after that. get to a red light and start to take off and make the turn at the light, you will be between 1000 and 1500 rpm and then the jerk,fluttering until you pick up speed. also in 1st gear,coasting down hill, the same thing happens.First welcome to the forum from the Keystone state. Not quite sure of your question regarding "coast in gear", but I know the EFI Wings will on occasion idle erratic at times. Sometimes resetting the ECM will help. I assume you are also referring to idle upon startup, since the Wing should not be idling at 1000-1500 rpm range. I'm sure someone on here will be able to offer so additional help.