I tried to search this one, but to no avail.

Overall my crusie control works as it should. The four positions on the cruise control stalk all do what they're supposed to (set/accell, decel, resume, cancel.) The only problem is that when engaged, the cruise control acts as though it is tapping on the gas pedal the entire time. If I place my foot on the gas pedal I can feel it going in and out.

Does this sound like a problem with the cruise control amplifier? If so, is it advisable to attempt to repair it?

Oh...the car is a 1987 560SEL, 242,000 miles, very loved