It isn't so much that it isn't linear. It probably is linear. Its just that with no current it was made to go basically to the middle openning. I'm not sure how it works, but remember I am describing the KE system in the 6cyl. I'm not sure the v8 works exactly the same way.

Check the idle speed with the electrical disconnected. If it is just a little high in park with the accessories off then it probably is as I describe.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician