Cars running way 2 rich

ok i have a 93 z28 and the thing is running very rich what can I do to make it more lean?

Any modifications from stock? Any data to show how rich its actually running? Running rich under what conditions..... idle? .... part load? .....WOT? ....All of the above?

Common causes of running rich:
-exhaust leaks before the O2 sensors
-faulty O2 sensors or wiring
-misfires
-leaky EGR
-faulty coolant temp sensor
-faulty TPS
-faulty IAT or MAP sensor (since its a speed-density car)