from throwing P1407, even after the check engine like comes on it still runs damn good, stable and steady revs. I was getting the P1407 (autozone had no info on this code) and a P0402 (EGR valve flow excessive), and I remember reading that the sensor on the back of the intake elbow (DPDE sensor or something - connects to the EGR tube) so I swapped it out with the one off my old engine (it didn't throw any codes, just a bad rod knocking). The P1407 popped back up a day after I changed the sensor. The codes used to come right on within 4-5 minutes or driving under 50, in the last 30 hours i've drove a lot before it came on so the sensor I changed must have helped something. What should my next step be, and what does that damn code mean? Thanks.