i have 61 hrs on my engine and when i push the throttle past 4100 rpms it dies,it starts fine but does not run well,then rpms keep going down until it wants to stall. i have heard about problems with the ethenol in the fuel clogging the strainer or filter in the VST tank. does anyone know if this is an easy fix? will i have to take it apart to clean this every season or is there a cure for this problem? how do i depressurize the system and what kind of solvent is used to clean the filter? i replaced the fuel/water seperator filter and checked the fuel filter on the engine. any info is appreciated. thank you.