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Always use cruise control. Only time I've ever had a problem was once when it was bucketing down, climbing a hill and there was a slight corner at the top... Bastard car kicked down a gear and tried stepping out. That was in the VT LS1 and the fact that my rears weren't in the greatest shape probably played the most contributing factor.
I need to say no more.
My VX used to kick out all the time in the wet whilst driving without Cruise Control.
Ergo it must be unsafe to drive in the wet without it.