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Hello, I think I know the valve, can you send the wire colors to it to be sure?
It is the fule pressure sensor and fuel temp sensor combined, Yes, 100% it is a vacuum line, It runs down the fule rail on drivers side, makes a band around back of intake and then hooks to a nipple in the intake, The problem? I can find any picture to send to you of this vacuuum port, It is real close to where the vacuum brake booster hose, the 1/2" diameter hose from booster to back of intake. I wish I had a pic to send. Its a tight area but should be able to follow the brake booster hose, hwre it hooks to back of intake. Run engine and feel around that area or listen for the leak in that area, I know it helps if you remove the air inatke from top of the throttle body to make room to locate the fitting, This is why you hear a vacuum leak but,, it is around back of intake, Hard to see but it is shown as #8 in this link and lower left diagram, That is the vacuum hose
I will be on off, wish I could send more but 100% it is a vacuum line that broke or came off at rear of intake