i gave this thing a full tuneup right before i sold it... if you connect the vacuum line back up to the egr, no check engine light but the car runs like complete shit. i cleared the code but i knew that wasnt going to work. if the solenoids open and theres no signal that the egr is opening, its going to throw a cel. the cel isnt a problem i know what that is. my question is this vacuum regulator in line with the egr solenoid. its a little green and white plastic canister. i'm asking if anyone ever heard of this going bad before i go spend my whole paycheck at the parts store for something stupid.