I have 96 manual 3.4 v6 s/c URD kit 2.2 pulley. I have the fuel map tuned up good ,but in third gear(high rpm/boost) the ecu dumps fuel to make the afr too rich (9.6 to 10.8 afr ). When the fuel dump doesn't occur it is right on at 12.1 . Accelerating in 2nd it is 11.8,12.1 and sometimes at the top of second(rpms) the fuel dump occurs ,and third and fourth the fuel dump stays on until I let up on the gas. It only happens at high rpms and pressure. If I try leaning out the fuel map it may help a little bit but if it doesn't dump the fuel, it would be too lean.