I got my dads john deere jd300 when he past away. When we park it for winter it was running fine. we So when we went to getting it running it wouldn,t run. we replaced the points,rotor button ,cap, wires, spark plugs and rebuilt carburetor. It runs but badly won,t idle right and only run better with choke on. Iv,e took the carburetor apart 6 time to clean and inspect it. Everything look good what could be the problem? Thanks joey!