I have a 2016 Roush Stage 2 S550. I recently tuned it and added MU52 Injectors as the Lu47s were at 108Dc on the stock Roush tune. Since adding the injectors i get a bad studder when going under a load at 1800 rpm when i hold it in 6th gear. First i thought maybe a tune issue. Spent hrs and hrs on it and still always did it. I Have tried using Ford racing Mu52 data and using the 13 GT500 data as well as the LU47 data in the Stock Roush Tune. I did Notice the Roush LU47 data is not the same as Ford Racings data on Website. I loaded everything back to Stock Roush and it still did it. I swapped the LU47s back in as well as the stock roush tune and the issue went away. I was not able to tune it on those injectors as they were already maxed out at 6500rpm. Has anybody ran into this? Log Attached
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