I got a question for anyone who can help me out. I have stock ecu on 96'a.4 2.8q. I am going to be adding additional fuel into the intake. Is there sensors measuring the unburnt fuel and air in the exhaust? If so it will be reading less air is being burned so It will try to make the fuel/air ratio higher. I need to lean out the mixture. Can anyone help me with this area?

Thank you.
Luc Pro