Renegade 800 R4 high idle

[Terrypenton]

I have a renegade 800 with fuel injection.  Someone siphoned all the gas out of the tank and left the cap off.  The machine was sitting outside and I really don’t know how long the fuel cap was off but I drained the tank and put new fuel.  Afterwards when I start the engine, the idle speed is at 2500 and will not come down.  Have since drained the tank , replaced fuel filter and added fuel injector cleaner.  Nothing has changed.  Hopefully one of you can shed some light on this problem for me.  Thanks in advance

[Travis]

Most or all fuel injected engines have a idle air control valve, it's usually electrical, not mechanical.

could be a problem with it.