I have a typical small engine power washer which was running fine the first day I used it this year even on the old fuel. When I got a can of new fuel this year, it would start and run while I had the choke on, but when I tried to take the choke off, it would simply die. This was the case even after it had run awhile. I was able to adjust the speed from rabbit to turtle and back to rabbit with no problems. However, while it is in choke, I just am not getting the same power. What could be causing this small engine to only run in the choke position? It has oil. This is New Jersey, and every gas station now has ten percent ethanol mixed into the gas. I can guess that this has something to do with it, but how can I fix the problem? What exactly is the problem?