John Berry said: My '88 300CE cruise control is constantly hunting for the set speed. It's as though there is a short in the system or something, faster then slower at a very rapid pace. Any ideas?
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Seems to me this usually is the cruise control amplifier. Solder connections come loose on the older models. Do a search and I know you'll find all the info you need to either re-solder it yourself or get the correct parts.

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1986 560 SEL (159K miles)