I'm currently working on tuning my 85 K5 Blazer using a retro fit TBI off a 91 Suburban with 350/th400 setup for my 350 H.O. I am using the 1228747 (HD truck) ECM using $4F and tunerpro rt for tuning. I'm having issues keeping it from stalling out when going from park to gear. i would love some help with some things to look at in the bin other areas. I would also like to add a A/C idle raise somehow to the bin to raise my idle while using a winch or the on board air, but i have no idea how to add definitions. Help with this would be awesome too. Is it possible to use the $42 mask since its used for the 7747, which, as far as i can tell from reading, are very close to the same?