sounds like motor mounts to me. these flat sixes are pretty well balanced as shown from the smooth idles and such, but when the driveline is engaged there will be torqueing effect which will cause engine movement unless it is well secured.
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2005 Porsche Boxster S, 2000 Porsche Boxster 2.7L Base, 2000 Mazda Miata LS Supercharged, 2010 Toyota Tacoma TRD Off Road
Previous Vehicles: 2005 Ford Mustang GT, 1986 Alfa Romeo Spider, 1971 Alfa Romeo GTV, 1999 Ford Mustang
1977 Toyota Celica GT
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