Ken: Our 190 had a similiar problem. The tech replaced the driveshaft to flex disk bolts and that cured it. I don't know why but I was happy with the result as it was a low cost repair.

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David
'00 Mazda MPV Family's car
'83 300D 235,000
'84 109E 175,000
'74 280C 125,000 in garage; needs rehab or sell for parts???