The distributor internals are an abundant source of weird problems and
symptoms. Mine has at various times exhibited the following: loose clamp
due to cracked case, bent shaft, loose ground wire, broken vacuum advance
spring (connects to breaker plate), stuck mechanical advance weights. On
other cars I've also seen a broken vacuum advance diaphragm, and a stuck
breaker plate.
Also check the float bowl jets for debris, or a loose jet, which can
cause intermittent symptoms as it wobbles, effectively changing the float
height.
Good luck, and remember, you may have more than one thing going on here.
Sometimes it happens that way...
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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