Gentlemen, I have an '86 300E with a faultiy cruise control. When I put the cruise on it engages, disengages, engages, disengages in a rapid fashion and keeps this jerking up unless I am going uphill in which case it seems to be fine. However as soon as I get to level ground or downhill the problem starts again. Would my problem be the amplifier or the actuator or something else? Thanks for your advice.

Alex