Hmmm, if you've got power either side of the resistor IDT that is the problem. Did it suddenly die or have you changed something recently? If the ballast resistor has failed it'll show typical signs - will start, runs for a while and then the engine dies. You come back later - same thing. The ballast will get white hot, easily hot enough to burn your fingers. The ballasts for Mitsubishis of this era are all the same. Even if the coil is weak it will still generate spark and fire under normal load. Check your timing belt and your timing marks (belt could've stripped a few teeth - it does happen) do a visual on the plugs. Make sure you don't have a dead short somewhere attached to the ignition circuit like the fuel cut wire to the stock carb set up.