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some also have a transmission computer on the firewall that interfer with driving down the road if they go bad it will cause vehicle to downshift and go slow and then go no where until it cools down then it will crank and go again.
A quick way to test an alternator is to start the engine, and disconect the battery. if the engine dies, it was running off the battery. It should cotinue to run, if it does not your alternator is not working.
Best thing to do is go to an Auto Zone and have them scan your truck for any DTC codes. Auto Zone scan free of charge, there is just to many things that can cause the engine issues your running through such as detonation during acceleration due to timing issues to lack of fuel pressure. Good luck and keep me posted, be glad to help you get your truck running 100%