DTvn

My 2000 Acura TL is misfiring and I don't know what it could be. It only misfires in 2 situations. First start of the day and if left for a short break. So if I drop in and grab lunch for 15-20 minutes and come back out it'll misfire but if I go in to class for 3 hours and start it up it's fine. It never misfires enough to shut the car off but it does throw misfire CEL codes. I was thinking Fuel injectors were clogged but the symptoms don't add up. My fuel economy is fine, idles during the drive are fine.

Things i've replaced:
Spark plugs
Coils
Bank2 O2 sensor


Any suggestions?

Saudade

What specific codes does it display?

DTvn

It's always multiple random cylinders

thoiboi

DTvn

NGK plugs and Duralast coils. Changing them out didn't effect anything, plugs seemed fine but figured i'd change them anyways

Iggy

I'm thinkin' valve adjust or intermittent injector

Darksyne

Make sure all the EGR passages in the intake manifold have been cleaned out and see if the misfire continues or got fixed. The most that will cost is a can of carb cleaner anyway.