My truck has been running rich for a while. i have looked every where for a solution, with no success. it is running like it is missing a cylinder and exhaust smells like fuel. this is what i have done so far.

1. the spark plugs and wires look new.
2. the fpr looks new and is bosch. with no fuel in vacuum line.
3. the egr looks like it is working, but could not pull it all the way off due to the exhaust input pipe.
4. the injector are working correctly and are ticking right.

so what am i overlooking and what can i do?