I have a 03 Ford Explorer 4.6 L - V8. It runs very rich. Whats the problem?

Oxygen sensors are usually the culprit you may also have a clogged catalytic converter

Get the trouble code(s) read and post them here.

No Codes Showing.

What makes you think it's running rich?

Check for an internal code. Had to change the front cat converter on drivers side on my 2003

See I have a xlt sport awd flexfuel (it can run e85 that's what flex fuel is most people think its eco friendly which mine runs 13mpg) mine is extremely rich and basically I can spit flames with the excess fuel because of the air fuel ration which may be your problem get a professional tuner to fix the ratios, now mine has a surging problem at idle too, has no catalytic converter. (got a high end exhaust and removed the cat) and it has 300 some hp after a eBay turbo kit until I have enough money to buy a turbo to kick in around from Garrett that's the size of my head, that kicks in about 4 or 5k rpms and a supercharger thats for low rpms, but I dont know anywhere to buy them other than online and the turbo I want is 1800 and the supercharger is 1200 and I also need a tuner, dyno, and drag strip does anyone know someone in South new Jersey that tunes cars great? And where a drag strip is?