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Exhaust Pop then Lack of Power and Runs Rough

Engine

Vehicle Information: Year: 1974; Body Type: Coupe;

A friend of mine has a 914 with a 1974 911c engine dropped in it.His car was running ok then gave it a tune up.Now it has no power and running rough with a light pop in the exhaust (not backfiring through intake). Pulled out the plugs some are wet and not burning.Old cap was cracked. He put all the wires back as they were butstill not running right. Did not move the distributor or replace the points. Just cap rotor, wires and plugs now pop and no power.Any suggestions kindly appreciated?

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