Got an 04 8010 that runs smooth as can be until it reaches about 85% engine load. When it gets above 85% it will jump up to above 100% in a couple of seconds. Then the combine starts to shake left to right and pulls the engine down real hard and it about shakes you out of your seat. If I stop dead and let the power drop back down it runs fine again until I reach a higher engine load. It likes to do it more often when you go down a hill and then head straight back up or turning around on an end. It seems to be happening more and more often. Don't know if the rotor is out of balance, if it is wouldn't it always run rough? Also it just started saying the rotor loss average is at 30 or 40% but i figured it was a sensor because the loss seems to be the same as before, also when i shut the separator off it still says there is rotor loss. The combines got about 1200 separator hours and were combining 160 bushel corn thats 21%. Nothing to taxing on it.