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My car is sputtering at idle only not when I drive. I’m trying to figure out what the problem could be put the kit on about 2k miles ago?

I have a 2017 mustang gt with a Whipple gen 5 stage 2 with boost a pump. Just recently got a custom tune and the tune is great and everything the only problem it’s sputtering at idle. Like a slight misfire I can’t feel it in the seat and you can also hear it. While I’m driving everything is...