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What's the difference between a used Toyota's four-cylinder engines and their six-cylinder engines? A few more vibrations at stop lights. A four-cylinder engine gives you four bursts every time the crankshaft turns twice. A six-cylinder gives your six for every two. The result? Less vibration. You'll notice the vibrations more at a stop light rather than when the car is in neutral or park, since the engine is, in essence, suspended in the latter two modes.
If the vibration bothers you, you can have your mechanic try adjusting the idle up or down by about 50 to 100 RPMs. This small adjustment can have a sizable effect on the amount of vibration.