Is anyone else having problems controlling their idle? Mine is either too slow ( 1000 rpm ) or too fast (2500 - 3000 rpm). It seems like when I try to adjust it up, the rpm jumps quick. There is no in between. I can't seem to get it close to 2000. As soon as I try backing it down it falls from 2500-3000 to 1000. What do you think???