65 slant wont start

Most chains jump on shutdown, then seat out of time on startup, I wouldn't shut that thing off anywhere but home, lol! BAD gas & OLD gas not the same, & there's plenty of the former still out there, We get new cars in the dealership that won't start or barely run. Take a fuel sample, pour some on the floor, & it won't light w/a microtorch! Our new models are 13:1 squeeze, direct injected running 350bar of fuel pressure, lol!