Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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It sounds like you may have a clogged converter, you can remove oxygen sensor before converter to see if it helps or install pressure guage and monitor while reving engine, it shouldnt go over a few psi. If good I'd replace plugs and wires.
removed converter with in park you can rev up to 4500 and it will studder but i am not sure if there is a rev limiter