What would cause my truck to suddenly develop a problem "dieseling" (sp?) right as I'm getting ready to go out of town for the Holiday the cranky winch starts reving/idaling really fast when in Park or neutral, usally a quick tap of the gas stops this but now it doesnt...when I shut it of it still tries to run and sputter...even back fired twice...last week I made the mistake of running low on gas in the low temps and just barely kept it above Empty all week...then before I left it started acting up...I figured maybe condensation...??? put some "HEET" in and its still doing it!!!???...could this problem be caused by condensation???? IF ANYONE HAS AN ANSWER TO THIS QUESTION I WOULD REALLY APPRECIATE IT!!!!!!!!!!