Join Date: Apr 2009
Location: Santa Fe, NM
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Your fan is not at all capable of slowing you down - even if it was on all the time.
Sounds like sensor problem - which one, can be hard to say.
Get a code reader. they're inexpensive, and it will likely tell you which of your sensors is malfunctioning - or something else that is off, to get you in the right direction.
( or you can use any of your friend's Superchip programmer, - they have code-readers on-board )
Sounds like it isn't fueling right - which could be a couple of things, most likely easy to mend, as soon as you have an error-code to start with.