My car is now idling too loud. It has 240k on it. The injectors were cleaned maybe 3 years ago but never pop tested or anything. Rather than re-cleaning them, etc., is it time to get new injectors or do you keep the injectors and just get new nozzles?

I'm figuring there's no reason to clean and pop test these original injectors because if they currently work fine today, they might not tomorrow since they're the originals.

My car is not smoking or idling rough. Just louder than it should be.

1991 300d