I have a 1993 MB 300E 4matic and the cruise control is not working properly. When I activate it, it does come on but is erratic and does not hold its speed it jumps and stops?? What is the problem? Can some one explain how it is to work? How to activate it, set it, control , resume etc. Do I need a new cruise control switch, ECU relay, module or is there a vacuum hose problem? Please help me since I am new to this car and it never did work. I love this car and I just replaced the transmission and want to restore it as best I can.
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