I cant figure out what's causing all these problems in my Mustang It's a 2000 Mustang GT, completely stock except it has a cold air intake and a ford racing intake manifold. (recently installed) for the first 2 weeks after the manifold was installed the car was running better than ever. Unfortunately, it started misfiring when I was on my way back to lsu. Here are the trouble codes i'm getting and what they mean according to auto zone p0171 (fuel trim bank one condition) p0174 (fuel trim bank two condition) p0302 (misfire on cylinder 2) p0308 (misfire on cylinder 8) New spark plugs, new coil on 8, fresh oil, needs refrigerant but i'd like to get the car running properly first. Anyone can take a guess? I would like to make taking it to a shop the last option. After tuition and rent I just cant afford it right now.