Quote: Try disconnecting the vacume advance and see if it will help. I had a BB with the vacume hooked up two weeks ago that would do that with the vacume advanced hook up
I was going to suggest something of this nature, but to check and make sure the vacuum advance was actually working, as I had a situation that drove me nuts for a while, the vacuum advance pin on the end of the arm popped out of the breaker plate...the engine would break up around the 1800 and up range, of course it's always the last thing on ya list of things to look for!
