Fuel Tank Evaporator Control 6.0L

['02 HD]

Still trying to find the source of my vibration in the accelerator pedal at highway speeds.  

 

I started looking close to the throttle cable on the throttle-body end last night and noticed Delphi Part # 1997279 (Fuel Tank Evaporator Control) has a vibration at idle and rises as the rpms increase.

 

It has a rubber washer/bushing where it attaches to the manifold so I was wondering if this is to isolate the vibe or is the part defective?  I am going to test drive the truck this morning to see if I still have the vibe.

 

Any techs out there that have seen this problem with the 2500HD 6.0L?

 

???