I finally figured out the setting on the lsn that was causing the high pitch sound. it seems like the lsn likes to be rich. ok no problem. but for some reason it keeps stalling on me on slow down, why is that? I cant run any leaner on the lsn for i found the perfect spot. a little leaner will cause it to high pitch and overheat. so i am running it a little richer. also, shutting it down seems a little bit of a pain. because i am running little rich on lsn, it take some time to shut off when pinching the fuel line. i am affraid that it will run so lean that it will start to blow the glow plug. so what are my options here??please let me know, appreciate all opinions!!!!!