Vibration on deceleration after installing poly engine mounts.

I have BFI stage 1 engine and trans mounts and a ECS dogbone insert. I noticed that sometimes while decelerating that I will have harsh vibrations while passing through the 3,000 rpm range, this is from the engine as as soon as I engage the clutch or gas it instantly goes away.

Is this normal with aftermarket mounts?

Yes

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