August 6, 2004my G.M.C. Sierra 5.7 tbi has 148,000 miles on her and the injectors have never been cleaned or changed. It doesnt miss while running down the highway , but at idle it does have a slight uneven miss . Down the highway it just doesnt have any power . The truck doesnt leak or take any oil at all. Iv checked for vacuum leaks and cant find any . I also keep her tuned up, new plugs , wires, cap, fuel filter and oxygen sensor which iv just changed. My fuel pressure is 50 pounds.
Would it be a good idea to change the injectors or just leave her alone.