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The MAP sensor should not be able to affect the inside of the distributor. It sounds like you may have some kind of bad contact in your ignition system? Double- and triple-check the plugs and wires, cap and rotor.
If the stuff you saw in the cap was reddish-colored, I would tell you to get a new distributor. The "red dust of death" is a known failure mode for those...
-soD
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