Well, I checked the vacuum pressure at the acuator. It was 21 in at idle and 7 in when engaged. This seems to be within the 300 mbar and 100 mbar range the service manual talks about. This means the actuator itself is functioning properly right?
So it is either the speedsensor or shut-off valve...
I was looking at the GDL website and it says that my original amplifier was for a manual transmission whereas my current one isn't. But at the same time it says that my current rebuilt amp is "less surge prone".
Question: with the shutoff valve being the broken link... would this make the speed tend to want to surge to a faster speed? This seems to be the trend with my cruise... I am going to get on a very flat road though to properly test it.
Thanks again everyone.