Hello..I am a new boat owner and I test drove this boat last week, and all was great. I took it out today, and when I went to accelerate, the boat would not plane. I backed off the power and made sure I was not hung up on anything and when I tried to accelerate again the prop engaged but anything above wakeless speed the engine just seemed to rev up while the prop speed did not increase. This is a 1990 mercrusier 175 horse...in a 19' monterery boat. Any help or suggestions?