So far the faulty plunger in the fuel distributer sounds like the most likely solution. I have had the motor mounts checked and am told they are fine. Does anyone know how much trouble it is to find out if my fuel distributor is a little worn? How hard is it to take it off and inspect, then replace worn plungers if necessary?

Thanks

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired