Here is what I got... Idles fine on muffs. Having trouble keeping this thing running on the water. At best I can limp along at 1200 rpms but there is plenty of stalling and hesitation before during and after. Possibly of note is that when I try to throttle up, the engine nearly dies unless i quickly throttle back to neutral and it stays running. I have checked compression and replaced LP&HP fuel filters as well as cleaned the VST and replaced the HP pump filter. Battery is good, new spark plugs, new gas. Revving the engine in neutral finally produced a trouble code 3-2 for MAP sensor 2. Two of the cylinder heads are dirty which may indicate they are not firing. Before I go replacing pricey parts or hauling to the shop I want to see if anyone had knowledge or suggestions on this issue.
