Sounds like you need to check all of the linkages for binding. Re-grease all the ball joints on the linkage, and also verify linkage going to the cruise control unit as well as the unit itself. Feel around, and have somebody work the pedal as you do so. The problem will present itself.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition