The cruise on my wife's 300E liked to behave weird also, I have since unplugged the actuator under the hood for safety. At least on the gassers it will rev limit with the computer if the throttle gets maxxed. The diesels aren't so lucky in that regard

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'17 Metris(VITO!) - 37k - wifes (OC-41k)
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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
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