1 get a new spark plug and proper gap set . use b6hs .015- .020
2 get a new spark wire or cut and re-thread both ends- check continuity
3 check spark plug boot - they fail- just replaced one last night.
4 sand points with 400 grit -clean points with electrical contact cleaner
5 set points at .016-.018.
6 make sure that points open and close properly . no sticking -or lube with pb blaster and clean with contact cleaner
7 timing 14-17 degrees before top dead center