Remove the distributor cap and see if the #6 terminal is damaged. Check continuity from the #6 outer terminal of the cap to the inner terminal..... check continuity of the plug wire.... check the plug..... or treat the truck to a new rotor, cap, wires and plugs.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum