Intake valves are in the cylinder heads.
The EGR Valve is located on the intake manifold.
Most likely the intake manifold gasket is leaking.
screwed into back of intake,behind carb.
right behind the alternator on the truck and in the intake by the aac valve on a stanza ang axxess
intake valve is bigger.
theirs a vaccum line coiming from the egr valve,going to the btp valve on the back side of intake manifold,by back fire wall.
This Valve is located exacly under the intake manifold,u can see it if u look really closely with a flash light,but the only way to change this valve is by removing the intake manifold..which is a real headache.
It is on the back left side of the intake, just above the valve cover.
An intake valve is larger.
The bigger valve is the intake.
You dont state what year but it should be on the intake manifold on the passenger side
Intake valve sensors.128 385 03