ok it runs but poorly??

it will idle all day long, but it is kinda rough. like the carb is out of tune. turned the idle jet in till it about died, then out. I ended up with 1/4 turn out from closed on both sides. if I mat it to the floor, it sounds like it is sucking the air cleaner through the carb, but engine RPM is slow to rise. I will change fuel filter in the morning and see if that helps. may change to a low performance electric pump as well. I will give it a try and see if I can make it better. thanks for the help