O.K. bought a nice straight shaft weedeater a couple of yrs. ago ran great next year it didn't couldn't adjust the carb. So went to the local shop to get parts they just kinda laughed that's too old to get parts!! Got online found whole carb for about $60.00, put it on no different, it idles fine go to give it the gas and it falls on it nose, took it over to a friend to help me and it ran just fine able to adjust the jet. Brought it home fired it up and it runs like $hit. Took it to a local saw shop and he thinks it is the I.C. unit??? would it run at all?? HELP