i have a 91 corvette with a 6spd 80,000 miles. the mods vortex ram air,52mm throttle body,ported plenum and ported accel lg tube runners tpis long tube headers and a heated oxygen senser, with muffler eliminators, msd coil, new cap rotor, all tune up stuff is done including new fuel pump. 345 gears, i have a fuel gauge mounted in the car so at wide open throttle my fuel pressure is not dropping, here's the problem when i get to about 3800-4000 rpm's feels like i hit a wall will not go past that my freind has the same car but a auto and had the same problem and he bought a custom chip problem solved, i do have the ez link scanner all shows good. grt back to me asap it's driving me nuts. i do have the stock prom in.