Hey all. I don't really know where else to go since I haven't seen this as a problem/issue elsewhere. Whenever I'm coming in on an approach in the -700 (I don't know if the issue is present on the other models, but I'd guess so?), the autothrottle seems to yo-yo like crazy. It keeps jumping from idle to 70% to idle to 70%. It doesn't seem capable of holding engine power to actually maintain approach speeds. If trying to autoland, this basically guarantees you're going to drop hard on the runway. And even on a manual approach, the plane can't maintain an RNAV glideslope, yo-yoing up and down as it goes on the same principal as the engines overcorrecting themselves.