Originally Posted by DoubleVision
Just click on this link and then on "scenario" on each number.
If the gauge is going that far back and forth it sounds like the intake is getting pressurized which to me sounds like a intake valve is either burned or stuck open.
Thanks. I have this site bookmarked & have used it in the past as I have never faced any of the issues they exhibit, but would want the added info. I went to this page & believe me... what this gauge is showing is not even close to the scenarios they show. This is a "New one" for the list!