Started dying out for no reason?

I purchased a truck. I put fresh fuel in it, I added a bottle of Lucas gas treatment, I changed the oil and filter,I flushed out the cooling system put fresh coolant, and chaged the air filter. Yesterday it started dying out for no reason. I do know it doesn't have the proper battery and corrosion builds up around the negative side of the battery. It dies out sometimes while driving sometimes while idling. There are no diagnostic trouble codes. The lights on the dash stay on. After it dies out it starts right back up while driving without having to turn the key. I want to repair the problem and possibly flip the truck. So please can you help me out? I thank you for your time ahead of time.