tuning help

[darryl-noah]

wondering if someone could help me. what do i have to do to make my application work. i put a 5.7 L31 engine in place of the 4.3 in a 2001 sonona and had my 411 pcm flashed with a express van file. but now my trans won't shift right. tried the other way also and copied the engine tables from that file over to a stock 4.3 4l60e file. now the trans seems to work fine, but can't really test, since the engine isnt working right. seems like its misfiring. so is there anybody out there that could help me. any help would be great. thanks darryl my operating software is 12212156

[highpsi]

I would check the gear ratios from each flash file, i bet they're not the same...