Having an issue with my 87 4 by 4 dodge has the 318 ,,, new fuel pump , filter plugs and wires,, but has a cranky miss sometimes but will slowly clear up if your easy on the gas tries to backfire ,, first thing of the day it runs fine get to the store shut engine off return to truck cranks fine try to take off and it starts missing spitting and sputtering where do I start with this truck next???