My 2011 5.0 has a rough idle in park and that’s really the only time. It vibrates so hard it feels like I’m getting a massage in my seat but once in park, it stops. For the life of me I don’t know what could be the issue. I’ve changed plugs, cleaned throttle body. I feel like my idle is low as it sits at .5. Anyone have this issue or know why?

 

02 sensors?

 

Miles?
Error codes?

 

98k and no error codes

 

Clean the MAF sensor. *May not clear-up the issue but it's inexpensive and easy to do.
.

 

500-550 is normal idle. Are your seats loose?

 

Close the gap on your plugs. I did on my 14 and my idle improved a lot .

 

The new plugs should be correct, but worth making sure it's set to ~0.051

 

I closed mine down to .045 with no adverse effects. It improved my idle a bunch.

 

I believe that's out of spec. Idle will run nicely, but you'll be limited as revs rise.