Vibration while idling in a 2004 Carolla

Hi iliad, I don't know if you will like this answer, but here goes. For one thing you failed to tell how many miles you have. I own a 2003 corolla S with over 240,000 miles. Mine too has a little vibration during idle. I have bought but not installed new injectors just as a precaution (these are wear parts after all). Our cars are old by any standard, they have a timing chain that will also wear out over time. What I am trying to say is this may be something you might have to live with short of getting your engine overhauled, or a replacement vehicle. Have you tried having your throttle body cleaned? have you tried a better grade of fuel? So if you have done all that can be mechanically done easily, you may have to resort to more drastic measures (there is only so much a computer can do). I myself plan to live with the little shimmy (if replacing the injectors does not work). The car is reliable, and I like it. The choice is yours to make. Good luck friend!

Low idle speed < 600 rpm will cause vibration at warm temp and in neutral position or at parking[ auto]. Have the MAF and the Throttle body up , replace air filter if clogged and use NGK BKR6EGP [ GAP 1.1 mm ] .It should be restored. Wait for the learning period of ECU plz.