While the likelihood of cap/rotor failure may be low based on the mileage, I would still inspect them. Sometimes you can actually see traces in the plastic from misfiring - be sure to tilt them around in the light, paying close attention to possible paths between the cap pins. You never know...

Good luck - and let us know what you find.

1988 Isuzu Trooper LS
2.8l Isuzu 4JB1-TC intercooled turbo diesel
www.dieseltrooper.blogspot.com