First off, see if the passenger side vanity mirror light is working in the sun visor if not its your ignition switch, seriously!
From my experience...cruise control problems are the first indicator of an electrical problem. It seems to be extremely sensitive to low voltage.
First thing...clean your battery terminals. Make sure the connections are good and tight. Find where the negative battery terminal mounts to the chassis and use sandpaper or plumbers cloth to clean up that connection. Then, go under the hood. On the passenger side, toward the front, you'll see some black plastic connectors with a bunch of brown wires. Unbolt the harnesses from the chassis and rough-up the connections with sandpaper to provide a great ground for the components that the wires serve. Lastly, you'll find the ground/chassis connection for the DME computer just beneath the passenger side cabin air filter. Take it off, rough up the connections and tighten her down.
Now see if your cruise works any better.
If it does not...check the voltage on the battery...it may be time for a new one. Next step would be to check voltage with it running to determine if the alternator is on it's way out.
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Last edited by marti5; 04-24-2009 at 06:42 AM.