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Hello, I do not have info to send on how to remove the upper intake air plenum but you should be able to figure it out. That must come off and then the upper timing belt covers ( 2 of them) then the covers you see covering the plugs. Below is a breakdown of the components. You may? be able to do the job without pulling the T belt covers.
. Book time to do the plugs is 3 hours. You should also get the upper intake plenum gasket