Just bought a 2015 f150 eco boost. Have 37000 miles on it. When I give it gas from a stop, it makes like a gargling noise with no boost at all. Then as I give it gas I hear the gargling stop and all of a sudden I have boost. Took it back to the dealer they have had it for 2 weeks, said it was a turbo bypass valve and gasket. Well it wasn't, still same sound with no boost. Anyone have an idea of what it could be??
Thank you