ecu/coil/dist pickup. let it idle until it acts up then take the wire off of the coil negative primary terminal and (w ign "on") w a jumper wire jump the terminal (not the wire) to ground repeatedly like Morse Code and see if the coil secondary will kick up a spark & if so do you have another spare dist that you can plug in & spin it by hand (ign on) & also see if it will produce a spark. In the meantime check the reluctor gap and want no more than .008" at the widest point and no less than ~.006 at the closest checked w a brass gauge and different reluctor vanes portrude out further (just slightly though) but the vac adv changes clearances quite a bit but K.I.S.S. you'll probably see something apparent well before this. The dist has to trigger the ECU then the ECU grounds the coil primary. Holler when you discover it.