Hesitation

I have a 91 C1500 with a 350. When I take off is spits and sputters from about 800-1500 rpms. After that it runs great. I have changed the Fuel pump, screen & fuel filter, The trottle position sensor, idle solenoid, coil,injectors, fuel pressure regulator,EGR, ignition module, pick up coil basicly everything except the Spark Control Module, plugs and wires. Anybody have any input???

I have a 91 C1500 with a 350. When I take off is spits and sputters from about 800-1500 rpms. After that it runs great. I have changed the Fuel pump, screen & fuel filter, The trottle position sensor, idle solenoid, coil,injectors, fuel pressure regulator,EGR, ignition module, pick up coil basicly everything except the Spark Control Module, plugs and wires. Anybody have any input???
Well I have now replaced the entire distributor, cap rotor, plug and wires. I also swapped out a Spark control Module and Map Sensor. Still the same. Does anyone, anyone at all have any thoughts, any thoughts at all, I am at my wits end. Starting to get a little pissed.

You have probably already check this, but I can't think of anything else. Check your pvc hose and power brake booster, and hose for leaks. Any unmetered air can cause problems.

spay your thottle body with cleaner