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Diagnosing rough idle 200 1976

I have a sweet 1976 265 that just turned over 90k last week. Overall pretty good condition.

While driving 80 it is as happy and smooth as can be.

the idle in park is pretty smooth. When I drop it in gear, however, it get pretty rough.

To help with warm starts I replaced the fuel accumulator. From there I replaced the wires, plugs, cap, rotor, nerly all the vacuum lines, the o rings for the intake manifold and fuel filter.

No real change with each of the things that I do. Any suggestion on further diagnosis?






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