Hard warm starting can be caused by over fueling due to improper sensor data from the Engine Coolant Temperature sensor or from leaking injectors.  I've also experienced internal swelling of worn fuel lines cause hard starting or stalling after the engine was running for more than 30 minutes. 

There is no external wedge position sensor on 2006-07 or 2010.5-2014 Malibu boats.

The wedge position is calculated by the Lenco wedge control box under the dash.  It uses the "lobe" count of the actuator motors to send the position data to the MMDC or Viper gauge controller.  The lobe design of the actuators was changed by Lenco in 2012 from a 3 lobe to 5 lobe design. The older 3 lobe actuators are no longer available and position sending issues can occur when they are replaced with the currently available 5 lobe actuators unless the Lenco control box is also upgraded. 

Hello,

I have a Malibu barefoot boat 2003 with the Hammerhead 375 engine. When the engine is cold and I start the boat, it runs normally even under full and partial load. As soon as you drive for a longer period of time at a higher load and ease off the accelerator, the engine stops and is difficult to start. Our mechanic can't find the problem either.

1 hour ago, The Hulk said:

Edge marine in portage Mi I heard had a fire . Not sure how many boats or what brands or extent of damage yet.. could be a help to M&T/Tommy’s. With some incoming insurance $

@MalibuNation might have some insight on that.  They are a small MB and Viaggio pontoon boat dealer.

8 minutes ago, justgary said:

The best jack I have found for tandem axle trailers is a stack of 2x6 boards offset enough to make a ramp up and tall enough to get the desired tire off the ground.  Four is usually plenty.  Break the lugs free, pull the trailer onto the stack, change the tire, back off the stack, tighten the lugs.  My last tire change on the road was five minutes from blowout to rolling again.  That could be shorter the next time since I now have a battery-powered impact tool.

My rams have a bottle jack that works perfect for trailers, so no need to carry anything extra besides the collapsable 4 way wrench that I keep with the stock tools.