6.0L 4l80 swap, stage 2 truck cam and 35s. Pulls like.a train up top.but down low wants to spit and'backfire through intake at WOT from a stop, set up an afr error and trying to copy and paste special, also added to maf chart, cant seem to figure it out. Any ideas? I can.post my tune later if anybody wants to take a look.thanks.