Still get a random misfire going downhill on the highway. It hasn't tripped a cel for it yet . I'm guessing that is not normal. I'm going to try changing the fuel filter.

My short term fuel trims are close to 0 on the highway long term -14 (seems high). Wonder if my fuel pressure regulator is having issues? Does the FPR cut fuel pressure? It seems like whatever the problem is its too much fuel in the chamber during deceleration causing a misfire. At least it seems like for now I have fixed my code, but I would like to fix this issue as well.