My daughter is having a problem with her 4cyl sonata. this is a 2007 with 118,00 mi. The check engine light came on and the code read too lean at idle. She had not serviced the air cleaner in a while. I replaced the air cleaner and also replaced the plugs. The car runs fine most of the time however on occasion it will miss and be hard to start. The same code is present.

 

What was the code? Possibly a stuck open purge valve or PCV. Possibly an intake gasket leak.

See here: https://www.hyundaiforum.com/forum/h...le-p2187-5564/