I hesitated to suggest that Motor Mounts could make a difference in vibration at idle, except that mine went away after changing the Motor Mounts... Glad my wild guess was helpful.

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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S
2001 S600 Daily Driver
The Universe is Abundant ~ Life is GOOD!http://www.classiccarclock.com