ok i swapped in a vtec head into my 98 civic a month ago and everything was fine, but now i got a check engine light and the code was 45, which is "to lean or to rich", so i bought a Air/fuel gauage , then hooked it up and it was all the way to lean, then i took out my spark plugs, and they were blistery white which equals lean mixture! So i checked my o2 sensor and everything checked out fine (Voltage, ohm,) Then i replaced my fuelfilter....Then pulled out my fuel rail, checked that! Then i checked my injectors, those checked out fine too. Then i checked my fuel pressure thats fine too. My ignition and mechnical timing is also good too What else am i forgetting, did anyone have a problem of running lean like this before???