how do u know thats wrong tho..

Nxt tim ur out try and start the car. then check the plugs smell them do they smell of petrol?? if so sod all wrong with metering head

Take a spark plug out and hold it on the manifold with ht lead connected turn car over and check for a spark..no spark could be fooked plugs try a spare one just to check.etc

Dont waste ya time buying parts that could be ok when the problem could be something silly like foooked plugs or a connection thats not on.