Why do all the vehicle monitor systems on my 2007 Dodge caravan fail

Hello, what is O2S21 and O2S22 doing? Being a V6, you have 2 pre and 2 post catalytic converter oxygen sensors. Regardless of this information, it seems like you could have a fuel / air control issue. Idle rolls often occur when your air and fuel are trying to sync up but just can't due to something that isn't monitored happening, such as with an unmetered air leak. If you introduce fuel around the intake, such as with propane, does the idle straighten up? Hands on testing is needed. I appreciate the data, but being able to check individual components is needed, and checking for vacuum / air leaks hands on is needed. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops