My 2008 Silverado(5,3 l 4L60E) has strange rpm fluctuations.
I can not pinpoint what causes this.
See the video for what i mean.
When i drive at a steady speed manual or on cruise control my engine rpm starts to go up and down by about 150 rpm.
It is not that it is switching between 4 and 8 cill mode.
It looks like it is the lockup switching in and out.
Does anyone ...