I just got a new B18B put in my car and I hooked up my A/F and Boost gauges last night and my car is running way lean. Before the new engine at idle it would bounce between lean and rich and when I floored it (open loop) it would be all the way rich. Now it bounces between not even registering and very lean at idle and doesn't even reach stoich when it's floored. My car has also been making a strange hollow sound (can't explane it in words) when I would floor it in too hi of a gear. Kinda sounded like something trying to pump but not enough power. I was thinking it might be my fuel filter. Or my fuel pump (but the noise was coming from the engine compartment) Or maybe it's just my 02 sensor is going bad. Any one have any Ideas. I need to get this resolved before I throw my turbo back on. Thanks.