My Merc 135 OPti has been in and out of the shop a half dozen times in the last few weeks. I have faith in the local marine shop. They have tried everthing they can think of and they have been on the phone with Merc a half dozen times or more and they are scratchin their heads too!! When they hook it up to the computer it says no faults. They told me today that the Merc factory tech is comeing next week to see what he can find.
It runs great once it gets up on plane and it will jump up on plane the first time or two each time I take it out but after that it really struggles to get up on plane and sometimes won't. The heavier the load the worse it runs.
Had my grandsons here from out of state this week and they were pretty disapointed that they didn't get to spend more time fishin with grandpa but it's really been too hot for them anyhow.