[nismo_pilot]

did you reset your ecu or did you just fix the battery cable, if your ecu isnt sending proper siganls to your injectors you may see misfiring and/or lack of power, your maf sensor could not be fried but on the way out and throw your a/f ratios off just a tad, at low engine speed it could also be your O2 sensors, sounds like youre running rich but you dont smell anything funny in your exhaust? a compression and fuel pressure test should eliminate the other two things on that list and if you still cant find the problem maybe your just not used to 1.6 liter POWAH!!!!!!!!!!!