2008 ISM 500 CM876 issue

[wingover]

Hi All,

Trying to diagnose and fix my engine. One day it just started to idle rough (vibrating the motorhome) after a few days it started to vibrate every time I try to accelerate until the RPM goes over 1300. After that engine run smooth. No check engine. Engine has 33,000 miles.

I purchased Insite and connected it (my first time so don't know much). I attached two pictures to show what I saw with engine OFF. I didn't run the engine with the Insite connected yet.

Any help on ideas and next steps?

Thanks!