My issue with my modulator has been resolved. It resolved itself and I didn't have to replace it after all.

dhjenkins- you might try the little knob under the gas pedal...that controls the idle speed....well at least thats what the issue was on my 190E. Had it turned too much which caused me to have a high idle and everytime I changed from P to D or R it would lurch forward a bit. Hope that helps.