As the title says, my 5.0L is running rich. You can smell it in the exhaust, and the mileage is not great. It starts and runs fine. Currently has 18K miles on it. In my '93 Ranger, I have a '91 Mustang A9P ECU and no EGR. The EGR is bypassed with resistors to stop the computer from throwing codes. I am running a Comp Cam with specs similar to the Ford e303, headers, O2 sensors, MagnaFlow hi flow cats and dual exhaust. The timing is set at 10 degrees. Any thoughts as to why it is rich and how to adjust it? Thanks.