I have a 87 xj with the straight 6. it was not running when i bought it. i use to be able to at least get it to start with gas to the intake, but now it has no spark. I was told to change the cps, but now i have no spark at all. i have replaced the coil and the module under it, the distributer cap rotor, plug wires. im getting fustrated and am looking for some ideas.