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Have u checked for damaged/kinked/broken vacuum lines?? I doubt it would be the solenoid since u say it does work,but only to 30mph. What it does sound like is a bad vac. line not being able to hold the pressure after a certain speed.
 

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I think the Cruise on 91 Carlsson's is pretty much all electric as it's probably a TCS motor.

So I'm not sure why it would work from 25 (it's lower limit) to 30 only, unless it has some clever bits to work out if gearbox speed to wheel speed.

I know it shouldn't work if you have a brake light fault (or not used the brakes that drive).

Also, if you have some pedal bounce on the clutch or brake it might knock it off. On mine I need to lift the clutch a fraction sometimes to get the cruise to come in.
 
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