Intake manifold runner flaps?
I have a LOUD knocking/ticking noise that I can hear from the front of the intake manifold. Like a empty paint can shaking. I just replaced the injectors and tuned car and then the noise happened, I replaced everything back to stock but the noise is still there.
Is there something in the intake manifold, like runner flaps that could possibly make that noise? I've heard it on mazdas before. Hoping not valve train noise