I have a 1991 3.0L Mercruiser with an Alpha 1 outdrive on a 19 foot aluminum hull Spectrum fishing boat. I put a rebuilt carberator on it recently and the boat ran great! Last time out, the boat would not get up on plane and I could only get 2800rpm's out of it? Any ideas as to what I should look for? The motor will rev nicely out of gear but in gear it won't perform. Thanks in advance for any ideas. Jim