Ok everyone so I keep pulling a Evap small and large leak code and I’m at a loss here … I’ve changed all the vacuum lines under the hood , I’ve changed the intake/exhaust manifold gasket I’ve done fuel cap and evap purge valve I’ve taken apart the throttle body and cleaned it along with all the sensors put a new gasket I’ve done the Pcv valves front and back I’ve done fuel filter and spark plugs did the power brake booster ,exhaust,
bank one o2 sensor and I’m still pulling the evap leak code nothing by the fuel tank or under the driver side rear wheel seem to be leaking I’ve sprayed brake cleaner throughout and nothing is upping the rpm I’m at a loss here once in a while the mixture leans out and gives me a fault of misfire in cylinder #1 but goes away after a day … also when it idles for a while the idle rpm goes to a steady 1000rpms up from the normal 700rpm… now mind you every single fix I have done has made a better impact on the her and gas mileage went from 8mpg to 13mpg … she has 320k miles but starts right up every time



The breather in this picture is gone and hose hooked into the intake pipe

 

You might have more luck asking on the GRAND Cherokee forum. https://www.cherokeeforum.com/f5/

Have you inspected the lines underneath running back to the tank? You have a fair amount of rust, so I wonder if one of those steel lines has rotted out.

 

And check the lines going to the evap canister. A bad/loose gas cap can also throw evap codes.

 

yeah even though the rust is there I have looked at and checked everything spend a fair time under there lol checked all the line to the evap canister also but can a worn out canister cause a code ?