about 4 months ago, i replaced my d15b7 with a rebuil d15b2, i received the block and head and I had to transfer all my b7 parts onto it.(manifolds, sensors, dizzy, etc. The thing is, i get really bad gas mileage, I was wondering if its because of the engine replacement, or mif some of my sensors are bad. I got a smog test and failed it. My car was labeled a "gross polluter", The car is also out of timing by 7 or 9 degrees, but it runs nice and strong, its just the gas miileage im concerned with:shakehead