This fault is not restricted to the 3.9, I had it on my last 3.5efi & that unit has no stepper motor, so be prepared to look elsewhere. Good luck!
 
Where is the stepper motor?


on the rear of the plenium chamber, drivers side. black plug, attached to the unit, which ti intense and purpose looks like a big plastic nut. also black, think its a 32mm spanner if memory serves me correctly.
 

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