ok to start with I have a VR senator, I have a strange noise, sounds like its coming from drivers side dash or firewall, its hard to describe, best way I can put it is its a knock but more but in the rhythm of the injector pulse, when ya feel the fuel line near the rail you can feel the pulse, like that but an audible knock from in behind the dash, it kinda goes away when you put the brake peddle to the floor but you can still feel it ??? very confusing and annoying, im sure it nothing in the brake system, all I can think sothin funkie with the fuel system?? maybe a vacuum / manifold problem ?? im lost on this one HELP ANY ONE, and hey if you no ideas a annoy one know an amazing mechanic that can ID weird noises in Brisbane would be appreciated