These Direct Trouble Code (DTC)s are for a big and a small leak from your vehicle's Evaporitive (EVAP) emission system. The first DTC P0440 is actually large enough of a leak to be classified as a vacuum leak. It is this one, really both are not good, but the first one that is responsible for your vehicle's drivability concern.
I have included factory troubleshooting flowcharts for both DTC's, but as you go through the first one, you will probably find both leaks. Go through these flowcharts and get back to us with what you find out.
Images (Click to enlarge)
Thursday, March 21st, 2019 AT 9:55 PM