I put my stock intake back in my '85 today because I will be doing a lot of hwy driving in the near future and I would like the quieter ride. I got new rubber mounts for it, but when I start the engine (which is running relatively smooth after valves and timing) the intake is vibrating violently at idle. I will be surprised if the mounts last more than a week. Is this normal?

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior