The definition of a rule is  an official regulation, code of regulations or set practice. An example of a rule is that a red light means stop. An example of a rule is an employer demanding their employees arrive at 8am.
New injectors cost anywhere from $80-$120 apiece, making their replacement a somewhat pricey endeavor. There are three types of injector leaks-it can leak fuel into the manifold from the nozzle, it can leak fuel into the engine compartment from the fuel rail, and it can leak air (vacuum leak) from the manifold.
Parts. The cost of the parts required to repair or replace your intake manifold gasket ranges from $25 to $100 in 2010, according to RepairPal, depending on the year and make of your car. This range applies if you have a 2005 Ford Taurus or a 2011 BMW 750Li.