I just bought a 94 formula firebird. Its all stock except for headers and a kn filter. As i was working on my car i noticed the fumes from the exhaust were very strong. In idle i burned through almost a whole tank of gas. The car seems the run very well with no issues. No sign of a misgire no sputtering. I did check the regulator but i couldnt really tell if its sucking gas in the vacuum. Please help im so lost