i'm chasing a code p2096 on bank 1.new valve cover gasket new intakes gasket new DISA valve o ring new rubber elbow to eliminate a vacuum leak new 02 sensors
so my other suggestion would be if has more than fuel then maybe it is fuel related new fuel filter. if the the pressure regulator is built in the fuel filter lets test it usually when disconnect vacuum to regulator it put it wide open you should hear a change in rpm. but been i have no vacuum i can't rule out a faulty/bad new filter.so i'm trying to find out why is there no vacuum present at idle on that port. best as i can describe it for now.