You mentioned gutting the cat, so is possible your sensors are either not working or look at the settings with your HP tuner.
Just a thought. Also check the grounds but if it is starting fine then those should be fine.
shipping of $600, MT.
Air, $960; Chrome Wheels, $545; PCQ, Premium Package (Leather), $525; Radio, 6-Disc with MP3, $495; Monsoon, $395; Premium Acoustic Headliner, $150; and Sport Metallic Pedals, $115; all totals $29,180.00
No XM/OnStar and NO Spoiler.
MODS (Magnaflow 2.5", BTF Turbo Upgrade wheel,DDM BB,ProBean&tune, Vntrshield, LVKFCB, JPM.
First 1000. Aggressive
with everything, NO XM/OnStar. SOLD