When im cruising at about 40 or 50mph and my engine can be cold or hot and i let on the throttle preety good i can watch my fuel pressure gauge bounce between 13psi and 10psi and my truck starts to hesitate or cut out but if u stay on it long enough it will catch but to itself after 4 or 5 seconds. I have the hx35 on it and i do need a bigger turbo but can it be defueling itself? or can the apps be going? or air in the lines?