Sounds like you need a tuner who actully knows how to tune for nitrous. A good tuner can compensate for when the nitrous first hits and goes lean, and then fix the rest of the a/f ratio out after that.
On another note. Since are cars have a returnless fuel system it does create a nasty lean spike at first, but like i said it can be corrected.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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