I have a 88 cherokee trail rig that has sat for about a month after wheeling all summer it has ben geting harder to start but nowwhen i try to start it cranks fine but wont chatch has fuel and air but no spark. i have repaced the spark plugs and wires over the summer. Im thinking its a senser but im not shure were to start cps? im not in a panic to fix it its not my dd but im geting ready to swap in a 8.8 but need to figure this out before i can have fun with the welder.thanks for any help.