Can someone tell what this part is?

veedubin

Official SM Decals
IJ. said:
Dashpot filter

Yup

The dash pot keeps the throttle blade from snapping back too quickly. It slowly lets the throttle come to rest to avoid driveability issues. ( ie stalling) the fuzzy is the filter, to make sure no unwanted crap gets in there, just air. check the TSRM for a better definition.