Hey first post here not a professional tuner just a backyard guy with a laptop. Looking for some help because I can't seem to fine any other posts on this. I swapped an l86 into my l83 silverado. Kept my 5.3 ecm and 6l80. No engine mods just a flex sensor and a cold air intake. Run e85 99% of the time. It's been my daily driver for probably the past 6 months or so. It drives great but it has this annoying low speed surge I can't seem to get rid of. They never made any e92a 6.2 6l80 combos. So all I did to start off was use the comparison tool from a matching year 6.2 and copied the engine tables into my file. Except the driver demand table because it was in axle torque instead of engine torque. I ended up using one from a 2014. Anyways I would greatly appreciate some advice on the right way to go about this or even pay to have this done right. Attached is my current file. 5.3 to 6.2 Swap E85 MAF Only.hpt