I had a similar thing happen a few years ago, The distributor clamp had
loosened and the timing backed way off. How is the idle?
MikeC
>
>This morning my '71 is running along just fine. Not a ton of power, but
runs
>up to 5000 rpm briskly. All of a sudden it will only go to 4000 rpm. It
>does not miss or sputter, just runs smoothly at 4k and still has normal pep
>until 4k is neared. Then the power starts to fade and it will now only get
>to 3000 rpm and not all that energetically. Life signs all appear normal,
ie
>temperature and oil pressure (40psi).
>The throttle cable seems to be working ok. No strange noises.
>
>What could this be?
>SteveM
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