Big Red Dog

You're right. Thanks for your reply. I should start with that. That will eliminate or confirm some things. Fuel is good. Ran 3 tanks through it with fuel injector cleaner. So I do not think clogged injector is the issue, especially since it runs fine above idle. It has no tach so I do not know exactly at what rpm it all smooths out, but at about 12+ mph it will run like a top. I found a You Tube video suggesting that it's an idle air control (IAC) unit issue. But with only 500 miles on it that should not happen. Now, those 500 miles was over 14 years, so the IAC could be gummed up.......So after checking fuel pump and double checking for air restriction, I guess I will find a pull the IAC and clean it.......

Bought my 2009 Yamaha Rhino, (fuel injected of course), recently from the original owner. Only had 500 miles and 70hrs. Starts reliably, however, it will not idle but about 50% of the time. Also, when driving slow in low or high, that is to say, relatively low rpms and below about 10 mph, it bucks and almost wants to die..... not smooth at all. However, at speed (say 12-15 mph or more) it runs very well, like it should. Any ideas?