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Running issue with 2008 BF225 with 1000 hours.

Thanks. I have cleaned the screen on the IAC valve and the fire screen in the air intake box. The issue must be engine temperature related. I can rev up the engine and let it idle at high RPM (> 1500) for a while. Then the engine won't "stall" after that. I will hook up my diagnostic tool with the engine running next time to see if there is anything out of ordinary.
 
Have you checked valve clearance, they are very critical to achieve a smooth idle. As Janz said too, O2 sensor can be getting old. doesn't always log a fault code. There's nothing to beat getting proper diagnostics, there more to diagnosing an issue than pulling codes. You also need a good understanding of sensor values, you can have a sensor sending an incorrect value without logging a fault. You've done very well so far.
 
Thank you for the reply. I will take a look at the O2 sensor values while the engine is running. A valve adjustment job is planned for this winter. So far I am happy with the engine. It is a 2008 engine with 1050 hours on it. I had it for 9 years and it has been good to me.
 
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