Decided to buy a 3rd FS90, I have a 90 & a 90R with the bikehandles that I use for the heavy/brushcutting but it makes a lousy backup to the lite yard work and the regular 90 I have is getting long in the tooth. The new 90R is a 4-mix and I really like it so I took advantage of my dealer's sale and nabbed a new 90. He put half a tank in and started it up at the shop before I left and it seemed to run fine, but when I got home later that day I had a heck of a time with it. It was sluggish to start, and died or bogged down when trying to go full throttle. Idled ok, for a while, but it didn't take off good if you blipped the throttle, and wouldn't run wide open at all, just kind of sputtered at half-power. I double checked everything, tried again but the same result. The gas is definitely good, it's running fine in the other trimmers so I was sure it's not that. Then, I noticed that if I dipped the trimmer forward, almost straight up and down, it took off and ran wide open. Dip it back down again, let it idle for a minute and it acts up again. I think I've got an air leak in the fuel line or the pickup. Oh well, I figure after 8 perfect Stihl buys it goes to figure I get one with some bugs. I'll let the shop handle this one as it's only a couple days old but I'm betting there's a leak somewhere. I was kind of ticked at first, because earlier at the other dealer in town I tried out their new Kawi trimmers, a KGT27 and was really impressed with the quality and power in such a light trimmer, almost bought one but decided at the last minute I didn't want 2 different brands. Oh well, hopefully it gets worked out....I know Stihl still makes a good unit.