Originally Posted by jpritche

Now I am not an expert by no means, so take everything I say with a grain of salt. If it is spitting and backfiring it makes me think that there is an AFR problem. So the first place I would look is to make sure that there are no leaks anywhere. I know you just said that you checked and everything was tight. All I can think of is an air leak, bad maf sensor or something along those lines...