I have a 1997 GMC Jimmy four door four wheel drive 4.3 liter V6 stalling issues

Hello, The most likely cause is the transmission torque converter clutch (TCC). Lock-up clutches in the torque converter are great on the highway, but terrible in the driveway. If the lockup solenoid is telling it to engage all the time, then the torque converter is now operating just like a manual transmission clutch, locking the rear wheels to the engine. Since this is locked together, the engine has to stop if the tires are stopped. Let me know if you have questions while diagnosing, otherwise, I'll leave a link to certified shops in your area. http://repairpal.com/gmc-within-10-miles-of-portland-oregon-97222