12. There are three adjustment screws on the linkage. One adjusts the opening of the front throttle blades to assist with idle and tip-in. The rear blades also have a similar adjustment. These may require adjustment, depending on your engine. There is one more adjustment that controls the front and rear throttle blades opening at the same time. These are all set at the factory, but depending on how aggressive your cam is will determine if slight adjustments are necessary to receive the best driveability.