For some reason my wrang wont start normally after i drove it for a bit. It starts great every cold (20-30F) morning when its sitting outside on my driveway witch is sloping upwards a little. But then when i drive and shut it off it wont start with out me having to giving some gas.. I just put in a new fuel filter. my driveway is sloping up but, not a lot so the jeeps front is higher then the back...