Just to satisfy my curiosity, when it's acting up, try getting under the hood and pulling the vacuum line off the EGR mixing chamber and see if the idle improves and/or if you detect vacuum at the line. Also see if the presence of vacuum changes when the brake pedal is pressed...
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-Evan
Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63
Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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