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    2.9 sudden vacuum drop, misfire

    Trying to smog '87 Bronco II 2.9 5speed 4x4. The engine is self-rebuilt with 33k miles. Replaced/renewed almost everything. The idle vacuum is 15", steady. Used to be 20". Even-misfire at tailpipe. Ignition timing is correct. Valves are quiet, seem to operate fine, lots of oil. Fuel...

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