So my 05 Kodiak 450 starts right up cold but soon the idle drops and it dies. If I drive it it runs fine until I let it idle. Also hard to restart. I put a brand new carb in it and it runs exactly the same. If I take off the air box lid and air filter off it idles fine. Even just putting the air box lid on, with no filter causes it to stall!? What should I be checking here? I’m stumped. Thanks