i have a 2000 ford f-150 5.4L V8 and its been sitting for over a year and was never started. So here recently i changed the spark plugs on them and a new battery and it starts up and runs but rough. After it warms up it idles pretty good but you cant push the accellerator without it hesitating real bad and when you put it into reverse or drive it idles so low it will stop running after a minute or two ! If anyone of my fellow ford nuts has any input on this that could help me with this I would greatly appreciate it.

 

Probably bad gas.