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and I want to know how can I change a its fuel Injector?
someone told me that I can do it by my self, but I dont want to try without too much information on how to do this.
Thanks

Its a 4 cylinder engine sir

What engine? 4 cylinder or 6?

If it's a v6 you just need to pull the upper intake manifold off and then the fuel rail. Rub just a touch of oil on the injector o-rings and reinstall. Pretty simple.