I just cleaned carb out on my old craftsman, It's has to be a 2000's model? It's never run better, but the idle just now runs too low! If i go into went grass it really bogs down! I tightened up the screw with the spring on the side (circled) and it runs better, but still low. It i manually open up the carb or whatever that thing is beside the screw (look at the arrow) with my thumb it really sounds good... So what did I do wrong when putting back together??