Hey guys, I just picked up this x5 from a guy that didn't want to fix it. getting codes p0174 system too lean bank 1, p0128 coolant thermostat below regulating temperature, and p0313 misfire detected with low fuel. I have not driven the car on the road yet, but seems to be stumbling slightly at idle. hooked up the computer and was getting no output from the maf sensor and being it was a reman unit anyways, I replaced it with a vdo new unit. still no reading from maf. I will be smoke testing it this weekend and trying to get it on the road as a car for my mother when she comes to visit. any help or insight will be greatly appreciated.