SOURCE: GMC Sierra 1500 power loss at 1/2 throttle and above
i had this problem when the engine goes into protect mode you will have to reset with a scanner and reset the fuel air mixture cause it dont reset it self i hate these computer model car
SOURCE: 1997 GMC Suburban losing power hesitation
I just went through this with a ford at the shop we threw parts at this car for days. It turned out to be the PCM. You can have all the best fuel pressures plugs, and MAF input but if the computer isn't reading it properly it can't work properly. The batterybeing disconnected is resetting the PCM taking it out of limp mode thats why it runs ok for short bursts. Its probably over-heating.
SOURCE: Truck losing power and service engine soon light on
Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.
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