Hey, I just can't seem to get my trail boss 250 to idle and run properly. I have eliminated the crank seals, and carb boot as the problem. I have tried 1 size smaller pilot jet, still no luck. While messing with the idle and air screw, it will idle too slow and almost stall or it will idle way too high. Tried moving the needle clip around as well and I just ant seem to get it. Any idea what's up?