I've had two main issues with the autopilot that I never had with the FS9 version.

The plane climbs slower than dirt while in LNAV and VNAV mode and doesn't seem to be able to follow the altitude assignments for various waypoints.  I tinkered with the economy setting, but even at 100, it still only climbs about 200-300 feet per second after 12,000 feet.  I figure there is a setting that I'm not getting right in the FMC, but I can't think of which one it would be.

The second problem involves the auto throttle speed setting.  Every time I reach cruise altitude and engage the speed hold (.80) function, the engines drop to about 60% thrust.  It's like it totally ignores the value I programmed into the AP.  I figure it might have something to do with the EPR setting, but I never mess around with the EPR.  I have to manually control the airspeed while in cruise, which is kind of a pain in the rear.

Any suggestions?