I think you may not be using the full NOS on the spray run. There may be a residual mix of this and regular fuel in the combustion causing a rich condition maybe for the return trip. Maybe you just need to change plugs..
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(96Cobra/softtop-3.73,almdrvsht,fancontrl,steeda sbfrmes+shifter,eibachspgs,pulleys,Bassani X pipe,C&L 80mm
Cobra DYNO 301rwhp horsepower w/out steeda timing adjuster
93 Ford Probe Gt(slower but turns)
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