Re: Missing at Higher RPM

Posted by steve828 On 2014/4/25 17:48:55

Went in today and cleaned the distributor breaker plate, cleaned the breaker points, and reset the gap, set the timing mark dead on with idle at 500rpm. When I set the timing, I did it with the vacuum advance disconnected at the distributor. I then increased the engine speed to high RPM with the vacuum advance still disconnected at the distributor..smooth as glass with no misfiring. When I reconnect the vacuum advance, and increase the engine speed to high RPM, the engine starts misfiring. Should I assume from this that I have a bad vacuum advance? Should I replace it, or just leave it disconnected (just kidding).
Appreciate all your further thoughts!