I have an fs80 trimmer thats been giving me problems. Was idling rough so I replaced carb. That solved that problem. Then after running for a while the trimmer would just stop, not sputter, just suddenly die. Many users on here recommended replacing ignition coil. I replaced ignition coil as well as the spark plug. That solved the issue of it just crapping out suddenly. After about a month of no problems the trimmer now will run perfectly for about 5-10 minutes at 1/4 to half throttle then if you decrease throttle slightly it will try to die unless you quickly give it a lot of gas. Sometimes it will die and if you choke it crank it, half choke it with full throttle it will start back up but you have to maintain over half throttle to keep it from trying to die. Any ideas, its a good machine overall so I hate to junk it. Also, compression test was good.