How is your fuel level in your tank and or your fuel pressure?
If you are sucking air into your fuel system inside the tank, you might exhibit the symptoms you're describing. If your tank is around 1/4 tank or less and are experiencing these symptoms, try adding enough fuel to bring it to a 1/2 tank. If the fuel intake system is sucking air from the mixer assembly, it'll begin to do it as the mixer assembly becomes uncovered by fuel about 1/4 tank. If you add enough fuel to re-submerge the mixer assembly and the engine/injector noise gradually diminishes, then that is where your problem lies. You need to do the "Hutch" mod.
If your fuel pressure is very low, the net result is the same, the injectors aren't getting enough fuel and will clatter, and the engine will run rough. Put a fuel pressure gauge on the port on the backside of the fuel filter housing and see what it says. Stock/unshimmed pressure should be around 50 -60psi. The best set-up is a fuel pressure gauge which can be observed while rolling down the road. When my fuel pump was going bad, it would have OK pressure at idle, but would fall off to about 10 psi at full throttle.
