i have a 79 also, if you get any and i mean any moisture in the cap it either want start or will fire and sounds likes like the head is about to fly off (bad popping and untimed fireing). if you dont have a filler guage to check the pionts a dollar bill is pretty dam close, it will run fine set with a dollar. id bet a dollar to a donut that its either moisture or you didnt get the points set back, wd40 is the trick for moisture