Question: So since I bought the car I have had issues with the idle occasionally dipping and sometimes stalling. The idle doesn't bounce, and I've replaced the throttle body gasket, map sensor o-ring, all the vacuum hoses except the lower PCV hose, PCV valve, upper PCV valve hose, distributor cap/rotor, spark plugs and adjusted the idle according to the service manual.
Is it possible that the lower PCV hose is the culprit? It's the only hose I haven't replaced. I did replace the PCV grommet that is at the breather chamber as well but the PCV valve that goes there is questionable, I wonder if I should replace it also?
Doesn't show the part on here but I'm wondering if #2 is the same as the upper PCV valve (#6 in the diagram, part number 17130-PM6-003).
Honda Automotive Parts