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I had a similar issue with a vortech supercharger. What fixed the issue for me was having a tech do a crank sensor relearn. Fords learn slowly but after a few days the issue went away.

I know this is an older post, but I had a surging problem as well that started about 6 months after I installed a vortech supercharger. The mass airflow sensor being cleaned helped a little bit, but what finally solved the issue for me was having a tech at a shop do a crank sensor relearn...