Thank you for prior help buddy. Have a 97 Infiniti q45. egr valve is supposed to lift when reving between 2 and 4000 rpms says the manual. It does not. This shouldn't affect acceleration below 2000 rpm right? Trying to fix lag before non essential systems. Injectors and pump test OK

yes, it shouldn'teffect if IF it is not in fact lifting at lower rpms if it's worn out