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What's going on with my cruise control?

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'99 Thor/Bosch P38. When I set the cruise control on the motorway, it'll constantly fluctuate in speed. If I set it to 120 km/h, it'll drop slowly to 115 km/h, then accelerate again, and repeat this process constantly.

I checked the vacuum system yesterday, manually operating the pump, and it kept the actuator perfectly steady over multiple hours, so that can't be it.

Any ideas?

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