My 97 4.0 IL 6 tj had a check engine light for cylinder 4 misfire. Me and my brother replaced all spark plugs and I got three codes for random misfire, cylinder 1 and cylinder 4. I took it to a shop and the mechanics said all fuel injectors needed replaced and cam and crank sensors needed replaced as well. Me and him replaced the injectors but not the sensors and now it will not start. Any suggestions?