OOOHH man another hesitating z32. i had one and did new injectors, fuel pump, fuel lines, 02 sensors, spark plugs, and even bought a whole new harness. everytime someone told me something diff to check, i did and i never got rid of that annoying stumble. i am sure that you can, but i finally learned to live with it, then i sold it. there are alot of things to check, how many miles does it have on the swapped engine?? one thing that i changed that made a real improvement was the fuel regulator and fuel dampner. check those as well.