When i started my car this morning (recently rebuilt 4.6 with CAI, and exhaust), it was running like crap. No power and sounds far more throaty than usual. My check engine light has been on since the exhaust went on and it says bank one O2 sensors are f'ed up. The whole car is shaking a little when i'm sitting still, and my gas mileage has gone from 22 to about 6-8. Any ideas??