ATTENTION: Okay guys I am in some desperate need of some mechanical advice. I have a 2001 Mustang GT (4.6 SOHC) it has a little over 100k miles on it. It has been driving perfectly fine since I got it, which was a few months ago but yesterday I went into a store for about 15 minutes then I came back out and started the car, it started up just fine but when I hit the gas it didn't rev or move after I put it in gear. I have a K&N air intake so I thought maybe it was the MAF sensor since they are notorious for getting oil clogged in them from the K&N. Well I replaces the MAF sensor and the EGR Valve and the Throttle Position Sensor, still NO LUCK. I also sprayed all the vacuum lines with starting fluid to try to detect a vacuum leak but I don't think it's that either. Basically it's like I'm not getting fuel when I hit the pedal, it sputters, and will NOT go up any hills/inclines it almost comes to a complete stop. Only codes showing up is that all 4 O2 Sensors are bad. Does anyone have an idea as to what this could be caused by? Any input is greatly appreciated.