Have an issue that even the best service guys are struggling with, the motor is a 175 and on a z18 Nitro,, before this all started there were power poles on it which have been removed. The 1st time out most times the boat will come to pad pretty normal. Have played with different props with no success, it seems like if the water is cold it performs better.but after that it wont go over 3000 rpms to get it up, if i put a body up front to make it get to pad it will run 60 mph all day. Just recently had some work done on it and am in the process of running some stuff through the engine. Compression checked out fine but said 2 cylinders had a slight bleed down, they are hoping that was from the carbon build up. Any thoughts?

Take the lower unit off , look up into the exhaust tube and see if the tuner has came lose and dropped

Thank you , will do.