it moves kind od slow, but it " bounces " fronm one to the other reading. i feel it when cruising, not under a heavy load i can accelerate above it and it doesnt seem to be as bad, but still there. at low speed you can hardly hear or feel at all. you can hear it kind of breaking up while cruising. not as bad as a total dropp in power



i did put it in park, pull off the filter, and run it to 2k. nothing...... it only happens under load.