hse 4.6 fuel consumption

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its dropped again today, 10.8mpg. i thinking about changing both sensors and have
decided that overhaul etc is not an option.
what does the stepper motor do?
 
The stepper motor mainly controls the idle speed.
Why is overhaul/checking not an option??? There are possible mechanical reasons for the problem. If only all faults could be changed by just replacing a sensor.:behindsofa:
 
i am pretty sure it is beyond my capabilitys and i havent made up my mind on
whether i want to keep it yet. i think it is because my head is against the roof.
 
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