I changed my pcv today and it fixed my p0171 lean code but I got a p0505 after a bit of driving, any theories? Idle likes to bounce at first after startup and it bogs a little in the higher rpms and that’s as far as any symptoms go

 

You may have to look and download a copy of the helms manual for your year and adjust the idle first following the procedures. These are old cars with old components that probably needs replacing. Your particular code, P0505, suggests that it tried to adjust the idle but was unsuccessful. May be a harmless code, but that is up to the user. My theory may lead to IACV but I would try and adjust the idle first to eliminate possibilities.