Got a 1996gmc Sonoma it drives for an while then it styles out and won't stay runninf

Hello. I'm sorry to say, this is not going to be something you can easily solve at home. I highly recommend having the issue diagnosed because it could be one of many issues. My immediate thought is the lock-up torque converter clutch may not be releasing all the time. That would be like holding the brakes and dropping the clutch in first gear of a manual transmission vehicle.

Recommend having scan test to determine why the check engine light is on.