vibration-low idle speed?

I've noticed lately some vibration in the tahoe when i'm idleing in park or drive, it's not a hard vibration by any means it's pretty light but I know it's not right. :confused:

My idle speed seems low also....between 500-600 rpm. Is this normal?
Could the low idle and the vibration be linked?

Any suggestions to either one would be great.

I've noticed lately some vibration in the tahoe when i'm idleing in park or drive, it's not a hard vibration by any means it's pretty light but I know it's not right. :confused:

My idle speed seems low also....between 500-600 rpm. Is this normal?
Could the low idle and the vibration be linked?

Any suggestions to either one would be great.


I forgot to mention that the RPM is stable around 550 if that helps at all.

Any clues on this one?