If I were to take a guess, I would suspect water in the fuel. Ethanol is notorious for attracting water. If the water is in suspension you probably can just run it out and see how it drives with fresh fuel. Stabilizer helps keep the fuel from gumming up the lines and injectors however preventing water is a different thing entirely. With your next tank of fuel add some fuel injector cleaner. I don't know where the fuel filter on your rig is but it is usually under the doghouse. If you want to prevent the problem in the future install a water block filter which will shut down the engine if you get water in it.
