Loose u bolts on a brand new trail boss causing a skip/misfire feeling???

[ThatBossChevy21]

Ok guys I finally joined this group and let me start off by saying I just bought a 2021 Silverado trail boss with the 5.3L. Since day one I’ve had this weird skip/stutter feeling at low rpm’s. A little run down on my truck, I’ve installed a mbrp cat back exhaust, cold air inductions CAI, and the Pulsar LT module. This symptom I’ve been having does it no matter if DFM is active or inactive so I know it wasn’t that. So here’s my question tonight I just reversed leveled my truck and when I went to take off the factory nuts on the U bolts they were not tight at all. I’m talking like 30# tight. So I went on and installed the 1in block after taking out the 2in and installed the u bolts back and tighten them down to 85#’s. Just took the truck for a drive and what do you know no more problems! Now can anyone tell me how loose u bolts cause the low rpm skip/ misfire feeling!?