The Steel Series Problem Solver replaces the stock aluminum plunger valve; which is prone to wear on the end, at the throttle cam linkage. This wear causes a loss of throttle pressure control. The main throttle control valve is included to replace the OE aluminum valve. The Steel Series Problem Solver replaces the stock aluminum plunger valve; which is prone to wear on the end, at the throttle cam linkage. This wear causes a loss of throttle pressure control. The main throttle control valve is included to replace the OE aluminum valve.