clean your maf, check if your blow off is leaking might be a good place to check as well. In nistune, try to see if there any consult gauges aren't working. I would also take a look under the consult view if your nistune is reading 02 correctly then try to rev your car, the 02 sensor gauge should fluctuate If not then make sure o2 is checked under flags(or o2 sensor is broken if its already checked) i had that happen once when my tuner forgot to activate it which caused my car to run rich.
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