Engine Vibration @ Idle?

[MAC4Runner]

I dropped my T4R into neutral today while waiting at a train crossing and noticed it ran much rougher in neutral than it does in drive?!?

Has anyone else experienced this? I noticed the same think when I dropped it into park. Anyone have any thoughts? Is this normal?

TIA

 

[mikes4runner]

Your RPM's should be higher when in park and neutral.
Is the RPM's even lower when in gear?
Adjust the idle.