Injector Size?

My fiance has a 1998 Pontiac Grand Am GT and I have heard of problems with injectors with the 3.1L engine. Her check engine light comes on and it says cylinder 3 misfire and I checked her spark and everthing and it seems to me that it is the injector, but now here is the big question does anybody know the size of the injectors becuase instead of buying stock crap ones I was going to just buy a set of Ford racing injectors since they are the same style. If anybody knows the stock injector #'s it would be appreciated. Thanks, Dave

How many miles on that grand am? Did it get a proper tune up previously? If your not sure look at the spark plug lines , if there are numbers on them it means they are original plug lines and you didnt get a real (proper) tune up. If it has had a proper tune up then it could very well be an injector. Let me know if that injector works.