Maybe a dumb question but what is this valve / actuator located under the EGR valve? There is a red vacuum line coming off the top and I found the other end free floating today. Where is it supposed to connect to? I have studied the posted vac diagrams and that hasn't clarified for me.
The fuel pressure regulator vac line should go from the nipple on top to the back of the upper manifold.
There is usually 2 small threaded vac fitting right next to each other, one for FPR and believe the other
goes to EGR think they are red and white.