Has anyone tried throttle body spring replacement on 99 TL? My throttle cable doesn't seem to return fully once car runs for few miles. I have cleaned throttle body and IACV both. Replaced IACV as well with no effect. Looks like the spring/pulley connected to the the cable coming from the left side of the bay (not the one connected to accelerator) has difficulty returning back. Works for a while after spraying with soft degreaser and silicone lobes only to get problematic again on the road.

Is there a part no for springs. I could find the whole TB assy only available for replacement and I wasn't sure if anyone else had a better DIY fix for this. Also, what is a good lube to apply to this spring harness.
DO I need to do anything on the CC box where the cable is coming from?

TIA.