stumped on my1996 200sx se-r.e need a little help in regards of the intake manifold
I own a 1996 200sx ser. Platform has a stock intake manifold.while taking out the intake manifold support brace to change my knock sensor I heard and noticed something fall out the engine bay by the drivers side.it appears to be a black plastic cap for a vacuum port roughly 5/8 inner diameter.does anybody have an idea where this might have came from?car has egr.bone stock no mods performed besides intake exhaust and headers.thanks in advance guys.I try searching this forum and others and came up clueless.please help.thanks.