86 22r with carb starts fine, but then idles rough. Seems like it is getting too much gas. Once it is warmed up (running for 5 minutes) still idles rough, but if I turn it off, wait a minute and then restart it, it has a little trouble starting, but then idles fine. If I restart within a half hour it starts fine and idles fine. If it sits much longer than a half hour it will idle rough until it is shut off, I waited a minute and restarted. I am not super mechanical so hoping for a simple fix or good mechanic. Thanks.