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Message: <blockquote data-quote="RanMan86" data-source="post: 121367" data-attributes="member: 22159">I'm a new owner of a old Monroe 600.  Worked great for a few weeks, but started to die when under load.  Has gotten worse in past week of daily use - does not want to do anything more than idle after warmed up.  When troubleshooting, I discovered that it was never making full power (pushing governor manually).  It will work fine for the first 15-20 minutes (about 75% power) where I can at least get the bucket into a pile of dirt.  After a short time, then the engine will die while trying to go into the same dirt pile, then eventually will die by simply driving.  Seems to stay running if I quickly pull it back to idle - can drive but not steer without killing engine.  Once it gets to this point, it will not go full throttle without choking out.I have checked the air filter - dirty but still looks like it has good air flow. Fuel filter is clear by blowing through it.  I'm stumped as if was a fuel or air problem, the issue would be persistent when initially started.  Choke works properly. Seems like something happens when it warms up.Any help is greatly appreciated!</blockquote>