2001 Toyota Corolla - Lean cylinder misfire help request

multi missfire
bank one lean

My crystal ball says… with the limited info you gave you probably have a vacuum leak. most likely a intake manifold gasket leak.


Any vacuum hoses appear to have come loose, laying around not connected to anything, or attached to a broken connector? Check especially the vacuum hose connected to the brake booster and the pcv system related hoses. If your car uses a vacuum modulated fuel pressure regular, check that too. If nothing obvious found, I expect you’ll need to hire a shop to do a thorough vacuum system check-up.