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Do you watch the tachometer? The problem should occur at about the same RPM in any gear, I would expect; if not, and it is truly a 5th gear issue, then engine "load" is likely a contributing factor.

There was one member (Broke Winger) that switched his actual vacuum advance unit to one that had a "weaker" feel to it, and it cured his high speed "bogging" if my memory serves. (I don't remember if the 1200s HAVE a mechanical advance, or if they are all electronic)

Some other things that might be considered as possible, could be problems in the carburetor slides and/or the diaphragms, faulty spark plug wires, or even a head gasket issue. :waving:
 
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