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How to fix thrust surge of autothrottle ?

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I am fixing up FS9 in a new PC and so far, so good. Everything works great including my GoFlight stuff. However, I have surges of thrust and speed using the autothrottle in the default jets and a 3rd party add-on panel for the 747-400 that I cannot seem to fix. The surging occurs at lower holding altitudes and on approach to landing. The N1 ranges from 40% to 60% during this period and the speed oscillates by around + or - 2 knots, i.e. a 4 knot range. On my older P4 PC, IAS and N1 are gloriously stable in such situations, using the same hardware and GoFlight set-up.Can anybody tell me how I might be able to fix this thrust surge? Is it a hardware conflict or is it something that might be caused by cfg files, a panel file, or whatever? I have five USB sockets in a hub for the GF equipment and use a MS FFB2 stick on a hi-speed USB port on the PC.Appreciate any tips, thanks!JS

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