It sounds like the module inside the distributor. This is what everybody goes thru when it goes,, they buy the ECU, ouch.
Some of these modules are available with research , without buying the whole 500$$$ from the dealer.

I'm research all these modules to try to get part # so no one has to buy the whole dist . from salvage or dealer. The plastic of the mod cranks from age degedation, so junk yard one won't last long.
Keep in touch with me I'll try to find out more.
Junk yard dog


dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.