(edited above some)
Diffetential pressure.... Lol. I forget the exact name, but it's vacuum lined in with the egr. It makes sure the egr is functioning properly.
You'd need a multi-meter to check it.
---------- Post added at 07:11 PM ---------- Previous post was at 07:09 PM ----------
Originally Posted by DHall31
I Tried that also it still is revving think resetting the ecu would work?
Any time you disconnect the battery for a few min, hours, days.... It should reset the ecu. Couldn't hurt. Just make sure you have your radio code.