New LS1 Owners - Newbie Tech - Ported tb/bumpstop mod cause issues with car at wot?

Some of you may have read about my issues with the car. It has a studder or flutter sound at wot. Put in new plugs and wires. Still does it. There are no codes. I had it scaned. This all started after I had my tb ported with the bumpstop mod. Could the tb cause this? I went through everything many time. I'm at a loss. The car is fine in town. Take it out on the back roads, go wot and this happens.

Is the car actually stuttering/shuddering at WOT or is it just making more noise?

Is the car actually stuttering/shuddering at WOT or is it just making more noise?

It's more of a noise. Like a flutter sound.

I get this badass whistling sound at wot. I love it.

kinda like a vacuum noise? like a loud sucking sound?

kinda like a vacuum noise? like a loud sucking sound?

No, the noise is like a spit/sputter sound. Like an exhaust leak. But there is no exhaust leak.

I guess make sure everything is tight including the butterfly but if the car doesn't run poorly I guess you can just leave it unless it really bothers you that much.

I put on a ported tb I bought from a member on here. And the noise is gone. The car runs much better at idle and drives better!