[Keithc8]

Here are a few things to check. You need to have about an inch between the top of the Mass Flow meter and the air cleaner top. If you have the air cleaner up in the scoop and the air is hitting it as it comes through the scoop it can cause a wierd reading as it goes through the air filter and over the mass flow meter. We build a damn inside the air cleaner at the front right on back of the filter to keep this air from going through the filter to fast.
Also make sure that the pump is below the outlet on the tank because these are pusher pumps and not suction pumps. I assume that you have the complete installation done as the Mass Flow directions says.
Where are your O2 sensors mounted in the exhaust?

Keith Craft