Problems with Auto Throttle (AT) and AP!!

[FlyinIron406 3]

Well, when I take a plane and fly somewhere, I put on AP and AT and set my speed. Now what happens is the AP and AT speed up, so say it is set at 290kts. It will go up to like 300kts, then the engines will power back to 290kts again. Then like 5 minutes later, the engines spool up and it will speed up to like 300 kts again. I usually fly right at or next to the overspeed of the plane. So it always makes it overspeed and stuff!Any help would be appreciated!

[rcbarend 37]

5 minutes or 5 seconds ?I've seen something simular. See:http://forums.avsim.net/dcboard.php?az=sho...ing_type=searchRob