Quote Originally Posted by glennsexton View Post
When you say timing gears do you mean a timing set, i.e., new sprockets and chain or did you put in a gear drive?

It sounds like a timing issue. Are you set at 8 degrees before TDC at idle with vacuum advance disconnected?
My bad, yes, it is a gear drive set. And the timing tab is long gone, didn’t think to put one back on when I was doing it, but I didn’t appear to have any timing issues prior to this, as the engine ran fine before the timing chain jumped