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its got nothing to do with my cats. its got to be a air/fuel mixture problem cause it does it exactly with more than half throttle. anything less it runs fine with no problems. no check engine light. ive checked all the igniton parts. MAF, MAP sensor, TPS sensor (actually borrowed one from a buddy and didnt help), replaced crank POS sensor 2 months ago. new cap, rotor, plugs, wires 4 months ago. it acts up regardless of PRND321. but if i just ease the throttle, it will rev all the way to 5500.....if i try to do it in park with the pedal to the floor, i get 4200 with sputter and acting like misfire at rev limiter is what it sounds like
If you want to cut off the Cat's and put on straight pipe, I can weld it back together for you.
lol... Most of us have been there, I have replaced SEVERAL cats...