I have a 1997 Cobra with an off road H pipe and am having the following issues. After running some errands in the Cobra for a few hours with the car running normally out of no where as I tried to accelerate when the light turned green the car acted as if it was not firing right( Hesitating, Sputtering). I pushed in the clutch and got normal response from the engine when giving it gas. But again hesitation while in gear and under load. I have had a check engine light on for a while but was told by a buddy who diagnosed the problem at his shop that it was due to the H pipe messing with the oxygen sensors. Now I am getting the same readings which are Oxygen Sensor and Lean fuel. Does replacing the four sensors sound like the answer to my problem ? PLEASE HELP !