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On Sat, 4 Jan 1997, Jonathan Hirschman (Pathfinder) wrote: > However, it still has the same problem from before - it misfires in 3rd > and 4th gear at certain revs (not always)...at about 60 kph in 3rd, and > around 80 in 4th. It happens more under heavier loads. > > I'm guessing the problem is the vacuum advance. I tested the advance by The finer points of ignition & induction are not my strengths, but... under heavy loads, if you've got the pedal floored, there isn't much of a vacuum in the intake manifold; it's very nearly at atmospheric pressure since the throttle is fully open. (Right?) It would then follow that the vac. advance--whether functional or not--wouldn't be playing much of a role in that situation. -Greg (hoping he got that right...) '71 squareback '63 Beetle