[jac912]

Electrical prob's are hard to trace unless you've personally followed all the wiring and know what they all do. I got mine running great last summer then had a very similar experience to yours. While driving, usually in the 2000-3000 rpm range the engine would cut out momentarily with the tach diving to 0 immediatley. Usually it would fire up after a second as ignition was still on and wheels are turning. Turned out to be a bad ignition switch. $7 at Advance Auto Parts for the simplest unit they had.
Jim in Ma.