fast93accord

I installed a missing link on my car today. The car is now running rich and throwing a code. I found that when i put my finger over the little filter on the side, the car runs normal. I dont think the filter is supposed to be sucking in air when i'm making engine vacuum. I took off the missing link, and the car is running normal. I think it may be defective??? Anyone ever have a problem with a brand new Missing link???