part-throttle miss?

Well it could be a lot of things. I had the same exact problem and the only thing that eventually worked was to plug my open breather elements in my valve covers. I learned this was not good while running a working pcv (creates a vacuum leak). I still have some minor bucking, but that is likely due to my fairly large cam.

If this is not your case you could always check for vacuum leaks elsewhere which cause similar symptoms.

Make sure your plugs, wires, cap, & rotor are good. Could be ect or act sensors giving false readings. Could also be maf, which I'm not sure you have.