Betcha money it ain't your coil doing that. ;)

The way to check your coil is two ways.
First with an ohm meter (a coil is nothing more than a transformer) check
both windings for resistance...
Primary is 1.0 to 2.0 ohms.
The secondary is 7,000 to 13,000 ohms.
That's straight from my Ford Shop Manuals. ;)

The other way is to test how long of a gap it can jump with a coil tester.
I've never used one of those and so far hadn't needed to. ;)
Anybody suggest I get one? ...and "why" would be cool. :)

Want to post more about the problems and what you've done to it lately?
A progression of how it got to acting up like it is, if it didn't happen all at
once, would be helpful.

Alvin in AZ