second the vacuum leak. I have better luck finding leaks by pressurizing the intake manifold with the engine off and using soapy water.
https://www.nicoclub.com/archives/us...-database.html
the FSM for your car has an exploded view of where all the vacuum lines from the IM go.
Here's a view of what you're working with under there (minus the PCV branch);
Do you have an EGR delete? A lot of the time, when someone does the EGR blockoff plate they don't take the time to get all of the old gasket material off of there and the blockoff plate barely seals. Could be a culprit.