I just finished with a full top end rebuild. I only did the rebuild because I thought there was an intake leak causing the sputtering. This was only after I pulled the tank and replaced all the hoses inside the tank and tested the fuel pump. I replaced the plugs and plug wires. I replaced the TPS. At this point I have replaced just about everything. After the rebuild the bike ran perfectly for 3 days. The first day that i decided to open it up just a little bit, it starts sputtering again just like before the rebuild. If I open the throttle enough the sputtering mostly stops. Its definitely more prevalent at lower speeds but still happens every once in a while at higher speeds. At this point I am thinking the problem could be the ECM, fuel injectors or the two larger square fuses under the seat. Can the ECM lose its tune? Is there a way to test the fuel injectors? I'm planning on buying the fuses tomorrow. I cant believe the bike is still having issues. I could use some advice. Anyone have any suggestions?