By amplifier, you mean the egr vacuum pressure regulator? I have 1 vacuum line that goes from the throttle body, to the regulator, and the other one goes from the regulator to the egr(both hoses are not cracked, and the hole in the TB is clean). Here is a link, maybe you will have a better idea of the system - http://www.fordscorpio.co.uk/egrmonitor.htm . Isn't the egr spring supposed to keep the valve closed, and upon backpressure from the exhaust, it should open it, and that valve regulator applies pressure to keep it open? I would like to clean the valve, but there is no way i can spray it while its on the car(unless i do it from the vacuum hole on top), because if i have to take it off, the intake has to come off too. It's in between the firewall and the engine, righ by the heater core tubes. It can't be done without taking the intake off(unless i pay the dealer a fortune and I don't have to worry about it).