So I haven't posted on here much but I need some help. My wife took the excursion to fill up today and after she filled up the truck immediately started running like crap. 2001 7.3l. It's started ruff and idled pretty ruff when I first got to where she was. I drained the fuel separator but it doesn't seem to have helped much. It still idles a little ruff but when you hit the pedal she really vibrates. I tried driving it down the street and have a real lack of power and lots of vibration. It's got an ate intake and 4" exhaust and that's all for mods. I was thinking it could be an injector but I really don't know. I pulled the connector off the ICP sensor and it's got oil in it so could that be the problem? Why wouldn't the check engine light come on? Any help would be much appreciated.