2011 Diesel F350. Started to notice that dreaded fluttering sound lately. The same sound that the 6.0L made. Tonight going up a hill truck started the sound and at the same time it was bouncing like power loss and then right back again. Lasted a few seconds and then went away. Not sure how to explain it. Anyone else having this problem? I hope this isn't the start of the 6.0 issues that I had which is why I got rid of it.