EGR tune map sensor

[Waterloo]

You ought to see the soot that is already in there. If it were me, I would REPLACE the map sensor, as there is not really anything there to save if it has been in there for a awhile. I would also yank that EGR plumbing off of the side of the motor and give it a good cleaning with carb cleaner. Remember, these motors create 6 pounds of soot between oil changes. If you have not had a look inside your motor yet, I believe you will be shocked.