The black stuff looks like deposits from octane booster. You wouldn't think it would need octane booster with flat tops. Can't imagine he put enough Sta-bil in there to cause deposits.
Pretty easy to isolate engine vibrations from anything else. If it is in the engine, it will vibrate with the car sitting still. If you suspect driveline, turning the engine off while coasting in neutral will eliminate the engine.
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12-18-2020, 06:58 PM
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