[Wakesurfer]

I have a 2016 3.5 w 10k miles...it has had a issue we been trying to resolve w no luck..I took the jb4 off, left dci.(it ran horrible even in map 0) Went to a mhd flasher stage 2 tune..it's mild. Issue-- consistently when
barely have your foot on throttle on flat road, no load on engine has a slight surging or pulse...we did get it to throw a code and changed a coil and plug...still have issue, it's not bad, but a little annoying to me...I'd like it to be gone before I put downpipes,intercooler,& inlets...so I don't have to worry about making the problem worse w mods. Anyone ever have this happen???? Thx in advance if anyone can shed some light on..