After reading threads on the Spint Booster I decided to purchase because of the terrible throttle responce. I insatalled the unit and felt the affects immidiatly but after a couple days I noticed surging while running vehicle on the way to work. As you can imagine I am a little anoid thinking the unit is either installed wrong or defective. I insatalled the unit the only way it could with male to female and vice versa. Has anyone had this issue. Thxs. Scottish