Time capsule non c10 quadajet question

[rockyrivermark]

Got a question on a non c10. Hope that’s ok but the carb is a very similar Quadrajet that’s used on our C10’s. So much knowledge on this board I thought this would give me good info as it usually does.

1986 el Camino
14,000 miles
The idle is a bit high and even with cables pulled off the carb it won’t return to idle stop unless manually turned back and has a bit of resistance.
More resistance than just new return springs will cure
Gonna dig deeper and check choke side and high idle set points but choke was fully open at idle.
Obviously the car sat in storage for extended periods but usually driven a bit year year.
it’s dads car/truck and some health issues kept him away for 3 years.
Is there something I should look for or a common problem that occurs with this symptom? I did WD40 on moving parts but didn’t help
Any advise or info appreciated.
Thanks
RRM