hi i am driving a 73 240z with a l28et swap. the it has full autometer guages. when i am driving around i cant go any higher than 4,000 rpm. cant figure out why it feels like its reving up to quick. its got f54 block with p90a head. stock turbo. the ecu number is a18-600-041k. i dont know what year the motor and trans are out of ? but i am guessing 1983. but i and stoichmeter says i am running rich. can any body help me out and give some idea of my situation???