S430 vibrating at about 40 mph out of the blue

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GPeter1202

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My 2002 S430 with 1800 miles everyone once in a while starts vibrating/shimmying out of the blue.  Feels like engine is misfiring to me.  Dealer says computer cannot find any errors.  When this happens, the info screen shows "no malfunction".  They thought it might be gas, so I switched to Amoco highest premium fuel.  Any ideas?
 
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