after you change that coil make sure your plug wires arent trading voltage. check your vacuum lines especially on that dang map sensor on the firewall.
by the way what year is she & what engine? how many miles on her.
i wonder if the crank sensor vibrated loose or got bumped. mine did that when some brush hit it.& my girl died right there the motor did all sorts of funky timing stuff.

93 xj stroked 4.2 w/4.0 head avenger supercharged 6.5" long arm 35" buckshots rubicon 44's front & rear