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If your running a stock 1G MAS then you will hit overrun with your setup. Overrun is when more air is flowing through the MAS than it can accurately count. It happens fairly early on the 1G MAS. When I have had it happen on cars, the car goes lean as the MAS puts out wacked out airflow numbers to the ECU. Adding fuel on an AFC doesn't help either since the airflow values that the AFC is trying to change are all messed up to begin with. The fixes are to hack the 1G MAS, put on a 2G MAS instead, run an GM MAF with MAFT, or goto a speed density setup.
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