1200-1500 you shouldn't be using the gas pedle and lugging the engine lol. However it can probably be ironed out in the tune. Mail order tunes are never exact unless you data log and send it back and fourth. My suggestion at the very least is log you car get/ watch a wideband and dyno it to see what's going on.
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2000 SS Procharger
98 Z vert turbo
07 TB SS cai catback and tune
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