Darren D 3/27/2012

2004 Ford F-150 XLT 8Cyl4.6L - Engine

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When stopped while in gear the truck will idle up and down then die. What is the most likely cause?

Idle sensor has been changed. Did not fix issue.

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  Camarozen 3/27/2012

  Are you getting any codes? This is an uncommon problem and probably has to do with the engine management system. I would test drive it with a scan tool attached to see what the sensors are reading at the time of the malfunction. It could be as simple as a bad sensor (MAF/MAP), a vacuum leak, or as severe as a faulty torque converter.

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