My 2002 - 300X just all of sudden started acting like its running out of fuel, its like its trying to go but surges.

Didn't have much time to test different throttle positions etc and didn't want to do any damage.

Ran fine all day, then we started it up to go home and at about 3500 rpm it started to surge or miss. It definetly didn't want to get up and go.

Came home pulled the plugs and it looks like it was lean for sure.


Where does one start to diagnose ?

I'll try changing filter tomorrow , it was new in the spring.