How do you know your running rich the egr(exhaust gas recurculation) wont cause it to go rich but it can make it run like **** eagle talons like to open up the fuel if the computer goes bad (safty thing) it would also explain why your not getting any codes especially if you are running rich also check the obviouse things like leaking injector is the talon a turbo?

Yup, I'd be looking at the EGR also.

The egr could be the problem if its not working correctly,,,