While switching batteries... i noticed a plastic housing that's supposed to keep snow from getting in the ducting to the air box... since it never snows here in Los Angeles I just took it off ...now how do i know if my car is running lean without having a diagnostic computer or having to go get a smog test. It's not misfiring or anything... i doubt what i did would fvck up the mixture so much that I won't pass the smog test... unless i'm wrong and i get labeled a gross polluter... 🙁 it's a 1990 dodge spirit by the way... 2.5 4 banger.