Anyone experienced this before. After my injector upgrade and other mods, there seems to be a rev limiter type sound when I stand on it. Fuel pressure does drop, but only to about 45 psi from 55. One other thing is that when I rev it up it comes back to an idle about 350 rpm higher than normal, almost like it's being choked. The only way to get the idle back to normal is to shut the truck off and start it again.