Originally Posted by bmsgaffer86
no its like i Set a speed and it holds it untill i go uphill then it gradually falls off (but i know its still on because when i switch the unit off i can feel it let go.) Well what i ment was arent the new ones non-vacuum controlled? So theres like no lines to collapse? (Or am i just completly clueless, which is very possible) . Now how hard would it be to put in a newer multi function switch?
Upgrading the switch itself seems a little pointless; it'* the hardware behind the scenes that the switch operates that is the main thing. If you put a newer multi-function switch on, with a wiring harness different than what you have, you won't be able to connect it. If you put on a switch that does have a matching wiring harness, your problems may or may not go away depending on where the current problem is.
From what you describe, it sounds like it can't accelerate when it needs to. Does the Resume feature work to accelerate after a stop? (Note that the system is not armed until you reach 25 mph.) You might have a borderline vacuum situation, maybe due to a partially-clogged exhaust that'* screwing up your intake manifold vacuum levels.
Sounds like the problem is like you suspected, a problem under the hood. Rather than go to all the trouble of trying to figure out how to install a non-vacuum system, if one exists, you should be able to figure out what'* wrong with the one you've got in a lot less time.