I have a Penta 5.7osi-af Fuel injected engine. Here is my issue. When the boat has been parked in the driveway for a couple weeks, I take it out and leaving the launch, I wants to bog done and comes down off plane. So I idle back down and try again, well now it gets on plane but the rpms fluctuate 200-400 rpms for about another 5-10 min. After this its runs flawless all day. So I am anchored out over night and when I take off the next morning after everything cooled off and cold and no issues at all. Problem only happens after boat sits parked in driveway for awhile. I have changed the following sensors... IAC, MAP, TPS ad fuel filers. Idles and revs up fine in the driveway also every time. Any suggestions?