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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.Due to the age of the Trooper, information is pretty limited but I have found a diagram for the intake along with a parts listing and there location, take a look at it and see if this will help you with reconnecting the parts you are having a problem with. Copy and paste the link to your browser to open and view it.https://dl.dropboxusercontent.com/u/104923897/Intake%20manifold%20Oct%2023..pdf
Unfortunately Isuzu offers limited information on the hose locations , I will open the question back up for you in hopes some else may have a better diagram for you. If they can help, they will post back.