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For the last year I had an aftermarket ported/modified TB on my '18 Z06 M7. I had put it on because I did not like the very slight "off-idle" hesitation/stumble, call it what you want. The aftermarket ported/modified TB improved the "off-idle" hesitation/stumble but it wasn't gone. I installed a new Soler Engineering SE8223-100 Modified, Ported, and Calibrated Throttle Body. It took less than 15 minutes. I followed the ECM learning/calibration which consisted of bringing the engine up to temp then revving to 4k rpm 10 times. Then, slowing revving off-idle several times, I tried my darndest to feel or sense the hesitation/stumble, (which with the aftermarket ported/modified TB, I would have noticed immediately).
It was GONE!
Thank you Mike for the time and engineering you put into solving this problem!
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