Hey there. Really need your help. My friend bought a used 2004 Yamaha Rhino for his family. Only after purchasing he found that it stalls after idling from 10 to 15 minutes. We checked the engine - no leaks, everything appears to work as specified. He changed the oil, fuel filter, air filter, tried to adjust the idle screw to see if that makes a difference. Tried lot's of things - no luck. The engine still stalls only when idling, not when moving. Any ideas?