12/72 fj40, died while sitting in a drive thru, just stopped running no hesitation no acting like it was outta fuel just died, thought it was some sort of carb issue, so let her sit for a couple hours went back and she started right up, so drove her home, next morning I'm taking my daughter to school and leave a stop light and it back fires (never done that before) and dies going thru the intersection, let her sit for a couple hours go back and she just cranks wont start, so start going thru the fuel system, filter, checking lines, etc. Get to the carb and crack the inlet line and get air out, then she fires right up, get her home again and decided to just go ahead and rebuild the carb, replace filter, just basic stuff, get it all done nothing looked out of sorts, get her fired back up and she runs for about 20 minutes then just shut off again no hesitation, no chugging just dead. But now after a couple of hours she doesn't restart just cranks and cranks, so I check for spark no spark, immediately think that coil is bad it's not old but whatever no big deal, so I do the whole thing plugs, coil, cap, rotor, condensers (at distributor and at coil), and ballast resistor, and points put everybody back where they came from, but she don't start. Got voltage on both sides of coil, voltage at cap, points, everywhere I'm supposed to, but can get any spark. If I momentarily ground the - side of coil I get a spark there other no nothing. I'm dying here guys and need help bad.