Smoke check it, start with the vac system first, if it passes. Move on to fuel pressures, could be a fuel pump going away, could be a fuel regulator going away, could just need a new fuel filter. CA plays with their damn fuel blends so much it kills rubber components constantly (had a HUGE issue with it here in PHX a few years back). Fuel quality can prematurely clog up a filter if its bad and it only takes one tanker to contaminate hundreds of vehicle fuel systems.
Best bet, start with the basics (and least expensive), then work your way up systematically.