I just replace the knock sensor which under the Lower intake manifold and change the rear valve cover gasket .
I was already replace all new gasket and seal the upper and lower intake manifold , also , replace all new small coolant
hoses / vacuum hoses on the upper intake manifold ( attached to the plenum ) . Additional , I already
connected all spark plug wires , breather tube , electrical harness conntors ......etc , But , When I try to connecting
both fuel lines into fuel injectors rail . Then , I discovered the fuel lines bracket under the Plenum , that two retainer bolts was walking inside the metal plate , almostly flat with the plate , I trying to used my finger at behind plate to pushing those two bolts out and pliers at front , try many times but failed . then , I try to used camera to located
the retainer bolts which holding this metal plate , So , I can disconnected it from engine block , it's also failed .
I was very angry and frustrated . please help me , Thank you very much !!!