03 ram 1/2 ton, hemi. from idle to 2300rpm it runs fine. anywhere above it falls on its face and stumbles and at wide open throttle it seems to be running about 3/4 throttle, just doesn't seem to have all the hp there. I've done airfilter, sparkplugs,and fuel filter. Im lost any ideas?

have you checked the tps or if you are getting correct fuel pressure to the injecters.G.L. BOB

try your basic tune up: plugs, wires