With respect to a malfunctioning cruise control, my understanding is that, if the switch or actuator is bad, the cruise control simply won't work.

My symptoms are as follows: when cruise control is engaged, the car lurches intermittently: speeds up, slows down, speeds up, slows down, OR it gradually accelerates and then slows down. This happens whether I push lever up (accelerate position) or pull in (set current speed position). Whenever I disengage the CC, it successfully disengages.

From everything I've read, it seems like a VIRTUAL CERTAINTY that I have a bad amp that needs to be repaired or replaced.

Do you agree?

Thanks.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife