So I got a call from a buddy of mine tonight saying he had replaced his distributor cap and rotor along with his plugs and wires, but the Jeep wasn't starting (98 XJ classic, 4.0). When he removed the old stuff, the rotor was broken. When the new stuff was installed, it ran for a minute, then he cut it off because of a misfire. When the new cap and rotor were removed, the rotor had dug into the side of the cap and broken (used BWD parts from O'Reilly). Went and got them warrantied out, and installed the new pieces. Same thing happened. When everything was installed we checked to make sure that it was right, there's only one way for the rotor to go on, which is how it was put on, same deal for the cap, both went on without any trouble at all. Everything went together smooth. I'm out of ideas except for the possibility of the shaft coming out of the distributor being FUBAR. And ideas?