Well, I'd like to thank everyone that replied to me here, and after yota4runna's explanation about the current being blocked somewhere beyond the coil wire, I discovered that the "mechanic" who put in new plug wires never seated one of them properly into the dist. cap. When I pulled it, there was a buildup of corrosion inside. Obviously built up over time and was barely any spark getting to that plug. Once I cleaned it (and put in a new cap/rotor kit since I had it) it now runs smooth again.
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91 SR5 Xtra Cab, 298000km, 4" lift, 56" rear springs, 33-12.5R15 BFG Mud-Terran T/A KM2.....and an '85 axle still waiting to go in.