No power over 3,500
I have a problem that doesnt seem to be getting any better. My truck runs great anywhere below the 3,500 RPM mark. On accelarating, as soon as it goes above 3,500 it loses power and will no longer pull. I can hear and feel the engine stuttering but theres no power on the climb to any higher RPM. Ive tried injector cleaners and ran premuim for a while hoping that it would flush out. No Luck!