Starts good, runs good for a few minutes, then it quits. No studdering. After a few minutes, it starts right back up but same problem. I have cleaned the ports, new plug, checked gas lines, cleaned air cleaner (it has no fuel filter), cleaned gas tank. It wasn't used for 18 months. Tried to use it last year, but it wouldn't start. Took to shop where they cleaned carb, but only started once after that. Then it wouldn't start. After all the work this year, it now starts but won't keep running. Can anyone help?