Been reading the message board for a while and you guys seem to have this stuff down so maybe you can help me. I've got a 94 bird that (for now) has the 4.6. The cats are empty, it has K&N filter, a power tower no resonator and turbo mufflers. The computer keeps throwing a lean condition code and a sensor out of range code. The car runs great for about 75 miles after i reset the computer but then the codes pop up and the car starts to run so rich it feels like it is trying to flood itself out. Sometimes it gets so bad the car backfires on acceleration from stop. This thing is my baby and all I want is my power and driveability back. If anyone out there can help me i would apreciate it.