I have a 12 EB and when it's in park and idling it changed about 2-300 Rpms, just constant up and down, anyone notice this with theirs?

 

when I first start the truck up ( '13 EB ). it idles weird. once its running for a min or so, it is 'normal'

could be a little condensation in the air intake?

I know they do start rich, and run a bit rich at times. I have however never had an issue with anything else. but I have also noticed that .
if it happens all the time there be a simple issue with something. with no code poping where engine light comes on, there could still be a stored code you could read

 

Yeah that's a possibility, It also does it on start up, and it's defiantly more noticeable then rather then after its warmed up. Thanks!