Recently purchased my 1st M-B, a 1987 300E with 110K. It has a few problems that I wish to address, and it seems that through this wonderful site I should be able to get the correct info. The cruise control basically doesn't work. I've been able to engage it only 2 times, each time it shut itself off within about 15 seconds. Any ideas?? Is this something I could take care of myself? Thanks!!