Finally got the bike back together and did and took it for a ride after replacing my throttle cable. Good thing I replaced it, as the old one was down to about one strand. How it got that way, I don't know. The new one is so much better. The backfiring and missing when I let off the throttle is gone, plus the idle has returned to where it should be, at about 1K and seems to be holding steady where it was moving before between 1.5K And of course the throttle is much easier to twist without killing my wrist. Hopefully I have everything adjusted right, but it seems to work fine.