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My 1990 300E will not upshift at times.

(1990 Mercedes-Benz 300E)
in Martinez, CA on October 19, 2014
Problem mostly occurs after driving for about 15 - 20 minutes.On Freeway the transmission will go into third gear and stay there, sometimes second gear. ATF is clean and at level. Any help would be appreciated.
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Popular Answer
on October 19, 2014
Check vacuum lines. Could also be a module. Call Contra Costa Auto Service in the morning at (925)798-1205. GL
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