ok so the California gas is about a year old? And the starting gets worse every month? heehee.
Pull a fuel sample out of the float bowl; it better be clear with no water in it.
Slightly yellow is a hard start but will run well enough to run around at Part Throttle.
Orange is really hard to light, but if you get her running, you can put her on the trailer.
Red is as good as skunk pee. Pour some on the floor and try to light it; you'll need a torch. Once lit it will smoke and stutter and stall out, leaving an ugly greasy stain on the concrete.
Modern non-ethanol gas, stored in a vented car gas tank, is good for about a month, maybe as much as two, but starting will suffer. Oxygenated is about half that in winter, one week in summer, or less depending on the ambient and if it sees the sun, like in a plastic gas-can..
Color is a pretty good test
Stabilizer will take even alcoholized gas to a year or more, here in Manitoba..
My factory ECUs have always been good down to 9.5v
As the gas ages, the more volatile compounds evaporate leaving the more syrupy, harder to burn compounds behind, which become more and more concentrated over time. To continue burning it, you will need to use more and more of it by increasing the throttle opening....... which drives the AFR ever leaner. A lot of that Orange gas is gonna go straight thru the engine unburned, and stink up your garage. And IDK what your AFR is gonna make of that.
EFI cars have relatively sealed fuel tanks and even a year later still start and run well. Course I guess the computer is probably working overtime.....