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If you removed any material around the area where the throttle blade rests you will have surging issues. The LT1 doesnt use a IAC valve, it uses air that bleeds past the throttle blade for idle control along with minimal throttle blade opening.
I had the same issue with a ported TB by a well known porter and it took another TB to fix the issue. Afterwards we figured out it was the throttle blade opening that was causing the issue.
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2019 Corvette Z06 2LZ A8 - Halltech CAI, AWE non-catted X-pipe, Mamo V2 ported TB 592rwhp, bone stock 566rwhp
2017 Camaro SS 1LE - Procharger D1SC w/ Tial 2" BOV & Race intercooler / ARH full length catless headers / Alky meth injection system - 650rwhp on conservative tune SOLD
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