It's fixed!! I ran it this morning after I had changed the throttle cable, and it ran perfectly. I then did some range checks, and they were perfect also. I then went out to the flying field and put a maiden flight on it. It was completely successful, except for the spark plug wire coming off of the spark plug in flight. I made an uneventful dead stick landing, and checked everything over. All good to go!! Thanks for all the great advice in this thread. I couldn't believe that cable made that much difference.