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Old October 23rd, 2007, 07:51
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ahm ahm is offline
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Join Date: May 2006
Location: Long Island NY
Posts: 60
P1391, What the ?

Trouble code P1391 - Loss of CMK or CKP ??

Does anybody know what this is?

The truck will run fine until you rev engine up to 2000rpm the engine will drop to 200rpm and giving it throttle wont do anything.
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