You could raise the idle speed a little, as that seems to fix it given that it's not evident in "Park". Other than that do what your mechanic has suggested and have him check the engine mounts.
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Mitsubishi Nimbus Pricing & Specs
The price range for the Mitsubishi Nimbus varies based on the trim level you choose. Starting at $2,530 and going to $4,180 for the latest year the model was manufactured. The model range is available in the following body types starting from the engine/transmission specs shown below.
The Mitsubishi Nimbus has a number of different wheel and tyre options. When it comes to tyres, these range from 205x65 R15 for Wagon in 2004 with a wheel size that spans from 6.0x15 inches.
The Mitsubishi Nimbus is available in a number of variants and body types that are powered by ULP fuel type(s). It has an estimated fuel consumption starting from 10.5L/100km for Wagon