I recently installed a 15% pulley and a couple days later I noticed my check engine light. Got it checked out ended up being a P0138. I believe it is because I'm running rich. Here is the list of mods. 15% SC Pulley Magnaflow cat-back exhaust Alta CAI Those are the only ones that would effect my engine. Should I get a tune to try and even me out a bit? I'm thinking about checking things out at Madness Motorworks. Any advice?