engine vibration

My 1988 w-150 engine has a vibration when decelerating staring at 45 and increases until around 35. Below that the vibration goes away. Any Idea what would cause this. I don't notice it when accelerating Brian

My 1988 w-150 engine has a vibration when decelerating staring at 45 and increases until around 35. Below that the vibration goes away.
Any Idea what would cause this. I don't notice it when accelerating
Brian

Wed, 04 Aug 2021 06:14:52 +0000
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