Yo,
Ok, do the evp test.
Code 33 means it's trying to open the EGR valve, but it's not able to tell that it's opening. That's why you're getting that rough idle. the PCM is trying to get it open by applying a greater vacuum signal, and it is probably doing so to an excessive amount because it doesn't have any clue it's really opening.
Ok, do the evp test.
Code 33 means it's trying to open the EGR valve, but it's not able to tell that it's opening. That's why you're getting that rough idle. the PCM is trying to get it open by applying a greater vacuum signal, and it is probably doing so to an excessive amount because it doesn't have any clue it's really opening.