i cant figure out why, but sometimes after i let off the throttle, it seems to stay on on the truck and it keeps going for as much as 2 or 3 seconds after i had released the trigger. i thought it was the carb, but i replaced that, and the problem persists. it also seems more prone to happening with a full tank than like half or less. could this be a pressure issue? i have no clue . plz help

My first thought is a poor tune
My second thought is an air leak
My third thought is a combination of the first two