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Well, engine mounts would be the initial diagnosis. My 1972 145 has a bad mount and the engine jumped around so much that it disconnected a rather important wire on the distributor. The mounts didn't look too bad to me back then, but I was not as mechanically inclined as I am now. New mounts fixed the problem.
With B18s and B20s, the engine will vibrate quite a bit if the lifters are really far out of spec. mis-adjusted lifters could be a cause. There are other more serious problems that might relate to the flywheel, or crankshaft, but I'd check your lifters and mounts before getting overly concerned. Even a poorly adjusted engine should not "buck" around too much with a set of good mounts...
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1967 P220 Amazon, 1972 145S, 1976 245 DL, 1983 245 DL, 1986 745 GLE, 1990 745 GL, 1995 945.... You mean to tell me that Volvo makes cars that are *NOT* Wagons?!? 1971 P1800E... Not a wagon, but it's just a donor car for the Amazon..
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