Yes check the resistance with your multimeter on ohms (probably the K range). Clip the meter tips to the plug wire ends with some extra alligator clips so your hands are free so you can wiggle the plug wire ends as you watch the meter. if you disconnected the vac adv & set the gap at .008" then the reluctor gap ain't the problem. For the phasing turn the housing till a reluctor tooth is dead even with the magnet. set the rotor on the shaft. install the cap & make a mark on the top circumference of the metal housing just below where the cap sets plumb vertical from the center of the cap terminal "bulge" closest to the rotor. Take off the cap & see how far the rotor tip centerline is from your scribed mark. Then pump up the can & hold it & turn the housing till the tooth is back dead even with the magnet. See how far the rotor is now from your scribed mark & note that vac adv will shift rotor phasing CCW on a SB and CW on a BB. Not sure how much gap will suffice before the available voltage is less than the required voltage (varies with every ign setup) & also an excessive radial distance between the rotor tip and the the cap terminals aggravates this (NAPA Echlin MO3000 rotor with a .060" longer metal tip helps with this-$8 & change out the door or make your own longer one) but post what you get. You have the circumferential distance (phasing) & the radial distance & if the total distance of both is too much it will misfire (more so) under load when the required voltage is the greatest but it sounds like you ain't under alot of load at that time so.... Keep us updated