I got this code read on my vehicle. My mechanic said that the reason for that code and the others was a tube or some type of hose. He said I would need to get the tube or hose and tap it with a hammer until I can get all the built up carbon and other things out. He said until I can blow into it. What is this tube or hose and where Is it located. I have a 2002 Mitsubishi galant. My car idles roughly and misfires.