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Yea the 255 fuel pump bumped up your fuel pressure, usually about 6psi+ in most cases, this will makes yoru fuel injectors larger than what they really are by the square root old vs new fuel pressure.
Sounds like your wideband has fouled out by running to rich, I use teh Innovate LM-2 so im not talking out my ass....in overly rich running the wideband will output some crazy lean numbers when in fact you are really running to rich.
You need to get a fuel pressure gauge and adjustable fuel pressure reg. if you want to get your car running back to normal again.
Sounds like your wideband is funny now, I suggest trying to recalibrate it, if that still doesn;t work you can try cleaning it with propane torch nicely and evenly moving it around, dotn concentrate in one area.
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