I've had the same rattle on my truck before and after cruise install. But yeah it definitely sounds like it comes from the accelerator cable. I think Bob said once that it is that spring on the top of the pedal that holds tension on the cable.

Whats this about buying a new harness for the switch? Why?

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Automotive Electronics Engineer
2000 XLT 2.5L A/T
Mods:
Explorer OHC
Explorer Autodim Mirrors w/ Autolamps
Explorer Sport White Face Gauges