Coneheads have been burning chips for the GM TBI's ever sence they first came out. There are several programes on line that let you change the fuel map to what ever you want. Come up with a good one and we will be beating a path to your door.
I wasted more then $100 on a JET chip for my first 2.8L Trooper Auto. Very little improvment if any. Would like to remap my Idle to 1200 rpm range as it is a little rich.

3 90 Trooper V-6's, 5 speed, 4.3L TBI, 31" BFG AT's, Fender Flairs, Bored intake, 1.6 roller rockers, MSD Coil, Jacobs Omni ignition. Heavy duty torsion bars, Rancho 9000 Shocks CAN'T SPELL, TO OLD TO LEARN, GOD BLESS YOU IF YOU CAN.