Let me correct myself. The car has been in Calif most of it's "life." I don't know if its a Calif car. I don't see anything under the hood. I had a 73 V8 Challenger. It had all kinds of hoses and canisters. From underneath, I see a tube coming off the pasanger side. I need to trace where it goes.
IIRC the fuel tank on CA cars had like 4 or more vent tubes coming out of the upper right edge of the fuel tank, and they snaked all around back there.
I'd just try driving without a cap, and if it didn't stall, then I'd know it was a venting problem. Make sure you have a less than full tank, too, for that test.
If that does the trick, then maybe you could get away, at least temporarily, by drilling a small hole in the cap for a vent.
