no codes as in I checked an dI know what you meant...... DAD :cool-blue:No codes as in no check engine light or did you hook up a code scanner?
I would guess a problem with the EVAP system such as a blocked hose, broken line, purge solenoid or EVAP (charcoal) canister. Even with diagnostics, without any specific trouble code, these issues can be tough to track down unless there is an obvious visual indication.