I have a similar problem with hesitation from start to about 2-2 1/2k rpms. I have done change my plugs, wires, new ignitor, cap, rotor, and also put some electrical grease on the contacts for the ignitor, and fuel filter. I have also run some cleaner with through my tank. All this help a little bit but still have the same problem. So I think it's the injectors now too because they quit a bit of noise. I know this doesn't help you much but I would like to know some other options also.