It may have appeared in the post above that I thought that replacing the plugs and air filter would cure my problem. I had bought these parts a few weeks ago and they were due.
I checked the coil with an ohmmeter and it reads as it should. I expect that means the coil is probably okay.
I removed the air filter and checked all vacuum connections and everything looks good.
I will post mid week with the results of the rotor/cap.
Thanks for the help,