The cruise control on my '94 Cadillac Concours Deville goes on but after a while, particularly at higher speeds going uphill it disengages. Will not go again unless I stop, sit for a while...then it all repeats itself. I just paid $929 to have it fixed. Servo and PCM were replaced. Problem continues. Needless to say I'm more than a little frustrated. Don't really think that I should have to research the problem that the garage personnel should be experts at.