I have an 88 yj with a 91-95 Cherokee 4.0 in it. It was running fine, then I had to change the wiper switch which I had to pull the whole column to do. Everything came out and went back together smoothly but wen I went to start it I now have no spark. I have checked my connections and still nothing, no blown fuses ect but I am far from a Master mechanic. Any ideas as to why I'm not getting spark? T.I.A.