Check your throttle position sensor.
A friends sons 97 gasser was having tranny issues.He was going to replace but did some more digging online and discovered the issue.
Replace the sensor and he is ratting the chyt out of it again.Been going for over a month now.
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews