I have a 3 liter, 4 cyl, 125hp 1999 Mercruiser. My motor will not react like it shoould, it dogs out when I put the hammer down. It will eventually reach 3/4 speed, what use to be 40 mph is now 30 mph. Same with RPM's. <br />Here is what I have tried already<br />1 tank of 93 octane, cleaned...