this is how you reset the ecu, if there was a stored code and such, the ecu will measure different levels with diff. sensors such as the map and O2 sensors, not sure how "tuned" it will be but it will reset verything, and the fuse will be in the fuse box on the pass. side under the hood beside the batt., should be listed on top of fuse cover, and should be a 7.5 blade fuse, in back of box by fire wall. hope this helps