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I think it's been called the mystery wire before? Doesn't go to anything on mine. As mike71800b, maybe has something to do with emissions on a CA truck? (Dunno why this is getting typed in bold :()

Mike
 

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Check to make sure your cable is allowing the throttle to completely seat (close). If that's okay, double check that all hoses are correctly routed. If that's okay, you may need to check with a vacuum gauge. What about injector O-rings? They can fall out on installation or get pinched and this causes a vacuum leak. Dennis
 
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