car engine loses power while driving! on 2005 Mercedes-Benz ML350

hi,,I have a problem with my engine. While driving when the RPM is near 20-24 the engine loses the power but car does not die. When I push the gas pedal it does nothing(the RPM stays at 20-24 and car does not speed up), but when I take my foot from the gas and push it again seems it works great until the same problem appears. Any solutions? thanks)

by in Clinton, IA on March 10, 2013
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