Maybe the Seafoam? I cannot imagine the tune would have this effect for any reason.
You possibly have an injector problem now that has been aggravated by that stuff. I really think your only option now is to take it to the dealer. (You should have received the "injector problem" letter from Ford.)
- Jack
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2014 F150 Platinum SCrew 3.5L EcoBoost 4x4 with SCT programmer
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