surging with level 2&3

[427R ROUSH]

Originally Posted by 08F150

My 08 did the same thing with the canned tunes. I still have an issue with surging on tip in more noticable in 3rd. It does it even with the stock tune. I will try to get a hold of Bill next week to give a more detailed description of the issue. Must be something with 08 with the latest calibration. Almost feels like it runs lean on tip in.

That sucks on the stock tune ,,mine only had a problem after the dealer reflashed..pinging valves on tip in. If i ran e-85 in it the problem would go away for while ,,, by chance is yours a flex fuel ??,,do you have custom tunes yet ??? good luck on it getting fixed HH