Have struggled with this piece of crap, a craftsman mo. 358.791030 convertable weed wacker, for 6 mos. It would never run at slow speed, and hard to get started. At first thought it needed to be broke in. Wrong. Have run several tanks through it and it's just as bad. Stalls constantly, acts like its running out of gas all the time unless you can get it revved up and keep it pegged, then it seems to run. The air adjustment screws are California "tamper proof", so I can't adjust it. I have the chain saw attachment but it's usless because you can't get enough power out of the engine to really use...