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Car surging and rough gear shift (auto trans) when cold on 1994 Mercedes-Benz SL320

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My car runs great when it's warm. However, as soon as it get cold (below 60 degrees) it surges when I take off and the trans shifts slowly. I had the mass air unit replaced and trottle body cleaned. Is there a trans control unit that may be bad? It appears to definately been temperature related. Thanks.
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