Only thing I can think of, unless it's a coincidence, is a partially plugged fuel tank vent
If you do not have a service manual, please run over to
MyMopar.com and download one, free. Some of them there got there because of some of the guys on here.
The cap is and is supposed to be SEALED. Look in the trunk, and feel around the filler tube. You'll find there is a tube brazed/ welded into the filler tube, with a 1/4" tube connected, that goes up to the top of the fender, then back down along the filler neck, and disappears through the big trunk floor grommet. That IS the vent. It ends down below, INSIDE the hollow frame of the car. It may be plugged. Try disconnecting the hose, blow air through it, and reconnect.
If that is not the trouble, I cannot imagine what might be, unless something like the fuel pump just decided to go bad.