So I recently installed the GFB DV+. It looks so simple and should just be plug and play. But with me this is not the case nor can I find anyone with the same problem. After I installed it the turbo will hold boost pressure for only one shift. After the DV+ opens then closes again it is like it stays open. The turbo no longer spools fully and the car is very slow. However when I shut the car off and start it back up it then again will let me have all my boost back for one shift then it won’t spoil back up. PLEASE HELP.