I have had code 455 and 457 for years .i do have a ford manual on cd.i do understand what to do and where to plug lines but i dont have a smoke machine. I drive down a 2mile very rocky and bumpy dirt road. Im leaning to gross leak . The hose going to inlet at tb has been changed because of gas fumes . And a new cap was install and old cap passed test.note i do over fill and car was hit just below fill tube,min damage to bumper the wheel took most of the blow. Need idea for smoke?maybe water?