My name is ***** ***** u Will assist you.
Can I get more information on the engine idle please?
FYI, there is no vacuum on these engines. It is air so checking the manifold does not cause this. Don't waste your time.
Does the engine idle come down when the auto fan for the A/C engages or just when the manual switch is flipped?
Have you noticed any smoking at all on this engine when you are driving or when the engine is idling? Is there a rich fuel smell when around the truck?
Do you have any oil/fuel mixing at all?
Disconnect the map sensor on the intake side of the engine. It will be between the filter and the turbo. Does the idle drop down?
Press the diagnostic button on the dash. Do you get any red and yellow flash codes?
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