So I have a 93 Audi 90s and it has an intermitent check engine light. I had codes pulled and its saying its the 02 sensors so of course i changed them and hmm same code, so i brought the car to a friend who put it on a smoker and said it was like a tipi bond fire with all the smoke coming from the back of the engine, he says its from teh gasket there..... ONLY PROBLEM I dont know what that gasket is called.... he pointed to the air intake hose where it goes into a black platic thingy and to the back of the engine.... CAN anyone help me and tell me what its called so i can have my baby running right again. I'm getting horrible gas mileage and with gas prices its getting rediculus....