Been fighting this tune for some time and making a lot of headway but still having issues. Little history first, It's a L96 6.0/4l80 DBW swapped into my 70 Monte Carlo. The L96 originally came with a 6l90 but went for the 4l80 so had to use a 08 GMC Savana E38/T42 matching ecm/tcm combo to get things working.
Mods on motor are LS9 cam/springs, LS7 card style maf and 1 7/8" headers
I'm having issue's getting my stft to stabilize enough to get it 5 to -5 (which means I cannot get my ltft in line either). I get a lot of timing fluctuation at idle from 10-18 Degrees. I also get idle surging when coming to a light. On top of that i can't get a case learn done cause even though the limiter is set stock to 4k for P/N, it goes right past doing a case learn. Also if you manually shift the gears the limiter is set to 6300 but it goes right past that too so none of my set limits work. I'm still fairly new at LS tuning (way different from 3800 tuning) I'm pretty sure my min final airflow table is off too which isn't helping
Any help or pointers would be great