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[StagHunter]

I just bought a TR7 on July 3rd from out on Long Island. The car is a virtual time capsule machine with only 7700 miles on the clock. It had been parked in an airplane hangar under the wing of the owner's Beechcraft V-Tail Bonanza. Did I mention we were in the Hamptons? 

During the drive home to NJ, I noticed the tach would sometimes go flaky, jumping up several hundred or a thousand RPM before returning to a more accurate reading. These excursions sometimes coincided with some flaky running in the engine, so I'm inclined to think I have an ignition problem as opposed to just a tach problem. Arcing perhaps?
This car has the Delco ignition system. Has anyone experienced this before? If so, what was the cause and how did you fix it?

[StagHunter]

FWIW, this problem has been solved. When I ran the engine in the dark it was clear the original green spark plug wires were arcing. Too bad, because they added a nice touch to the engine bay. A new set of wires, along with new plugs, cap and rotor, and the engine runs better and the tach is stable.