Recently got my ER6N derestricted and came across a problem that reared it's ugly head that never appeared. I put everything back together in it's rightful spot, had someone who's good on working bike with me to be 100% sure I'm good even though I myself is pretty good at wrenching on bikes. Whenever I go hard on the throttle, the power would fall flat and there would be a whistling noise coming from the bike and it would carry itself out through the rev range. This mainly happens around 3k-5k RPM. However, if I roll onto it it's completely fine, goes like a rocket ship. When I go hard on the throttle above 6k RPM there's no issue. I have checked if there was a vacuum leak on the throttle body boot by spraying starter fluid around it and that's all sealed and completely fine. That's all I've checked so far. It feels like the secondary idle valves are closing up when I slam on the the throttle and is only able to catch itself up when I just roll onto it. This is a problem I can live with for now but when it was restricted it never appeared. I have researched this problem and someone said that there was a wiring loom problem and had to be replaced.