Acceleration issue?

[IOWNATRUCK]

Hey everyone so i took my truck out today for a drive after it hadnt actually been driven in a few months, as i was pulling up a hill i hit the gas and the car actually hesitated, and then bucked forward and back a little, I dont remember it doing this when i drove it a while back, could it be that since i was very low on gas and angled on a hill that it just couldnt get enough gas? I checked the throttle cable, and all the motor mounts and they seem to be fine. any ideas?