So I'm experiencing a problem and I need help diagnosing it. It started about a month ago after I installed a pc3 and put in thicker oil for the summer time, I went from 10w-40 to 20w-50. It only happens in 2nd gear between 9k-11.5k and only if I'm WOT. If it's anything less throttle wise then it doesn't do it and it doesn't do it every time. Now what I'm experiencing is a skip or jump. The best way I can describe it is like if your chain skips a tooth on your sprocket. It doesn't bog, shut down, but the rpms jump 500-1k rpm and then return back down when it engages or catches whatever it does after it skips. I'm a mechanic at a shop and my boss doesn't think it's the transmission but something tells me it is. It's not the pc3 cause I took it out and it still happened. I have fellow friends who are knowledgeable about bikes telling me it could be my tps, a sensor or transmission. My boss thinks it could be a cam sensor or something electrical. What do you guys think? My bike has 44,700 miles on it.