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Message: <blockquote data-quote="STNG_96" data-source="post: 8739" data-attributes="member: 8012"><p>Ok, first of all, are there no O2 sensors bungs in the front? If there arent you need to go and have a shop weld some in, if there are, just connect the sensors and it will solve your problem. The reason the car is running terrible is this, ford dosent just put those sensors in for no reason, they actually do have a purpose. Basically, what they do is measure the exhaust gases for certain things. One is the Air to fuel ratio. So right now, you have no front sensors, and your back sensors are turned off. Now what the computer thinks is that the car is running EXTREMELY lean, because it is not measuring any sort of unburnt fuel in the exhaust, so what it is doing is running very very rich tune to try to correct itself. My suggestion, either hook up the front 02s, or turn the back 02s back on until you can hook up the front O2s, then you can turn them off again.</p></blockquote><p></p>