Have you tried bearings?
Regular Evo's have ALOT of play in the driveline, and bearings seem to help. I'm not sure if the cars have the third gear/idler, if they do, the bearings there help tremendously.
You might want to try some fresh non-rechargable batteries though.
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After a thousand years of oppression,
Let the berserks rise again,
Let the world hear these words once more:
"Save us, oh lord, from the wrath of the Norsemen"
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