I tuned my revo 3 days ago and it seemed to be running well and temp was good. Got it out today and tried to run it on a course we have built. As usual it started very hard (i don't know why) but I got it running. Ran about a half tank through it and noticed it started to idel higher and higher. I quick got a hold of it and it was screaming at this point. I hit it with the temp gun and 360 appeared, it has never read above 260 in the past. I know it means it is running lean but why. Weather conditions were about the same as the other day and everything was fine. I was not even running it that hard, it never got into 2nd gear. What would cause this? Any help would be great. I am still on the first gallon of fuel with it.