If The Vibration You Feel Is Above 3000 Rpm With Car Sitting Still, You Can Safely Say It Engine Related. But Before You Tear The Engine Apart, I Would Look At The Basics. Timing, Air Fuel Mixture And The Msd Unit Itself. I Would Take Out The Msd Unit To See If That Helps. Also, If You Have A Fan Clutch, It Can Cause A Vibration If It Is Locked Up.
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