Originally Posted by andrewwynn

when you get foxwell you should be able to run the test on that valve. Also once you locate the hose you could pinch it off or plug it with a dowel for testing.

Compare banks for anything that stands out different.

Check your throttle sensors very easy and there are two values that sweep opposite directions as one goes low the other high. If either reads badly the angle won't match in the computer.

As suggested in the link check for vaccine leaks of course.