persistent misfiring - help!

[Chuck Sea/Tac]

I was thinking the same as Steve in #26, and it's best to buy a good heat proof condenser and carry a spare. I've never had a coil, points, or condenser go bad on any of my cars, but have bought some bad condensers at swap meets.

Here is something I ran into that would cause your problem. The point arm spring broke, but there was still a little tension keeping the points closed. As soon as you revved it, the points would float. Just feel the spring load on the point arm to make sure it it has some guts.

One of the guys in our club ended up having that same type of problem. A weak spring on the points arm.

 

[Big hammer]

The symptoms sound like they could be caused by a manifold leak, but why do they only appear after warmup?

When cracked metal is heated, the cracks open up more !
Someone else had a miss fire here, s(he) removed the intake manifold and a chunk fell out. S(he) replaced the manifold and all was good!