My truck is acting a bit weird...?

Well, one possibility is that your transmission clutches are slipping so that the engine RPM goes higher in sound, but you don't accelerate due to the transmission slippage. If you have over 130,000 miles on an automatic transmission, it's days are numbered, especially if you never had the transmission serviced according to your owner's manual. You could bring the truck into the dealer shop and have them remove the transmission pan to see if the friction clutch material is building up as sludge in the pan, a sure sign of transmission failure. Otherwise you'll get a transmission fluid and filter change for about $120. Read your owner's manual on how to properly add transmission fluid (hot engine idling in park) because low level transmission fluid causes transmission slipping etc. You need a special transmission fluid narrow neck funnel to add fluid directly into the transmission dipstick tube. DON't overfill!!