Purchased a 88 Spider that’s been sitting for two years with a full tank of gas without being started. I changed the fuel filter and started it up with starting fluid , at 1st on 3 cylinders and then eventually all four firing. Changed the spark plugs and cables and car ran great for one day, still on that full tank of old gas. A week later won’t start, main high pressure fuel pump seized, replaced it with a new Bosch pump and drained the old gas out and replace it premium and now cranks for a few seconds and turns off. With this being said, car has spark and about 30ps of fuel pressure at the return line. If I clap the return line hose it stay on a few extra seconds. I replaced the fuel pressure regulator, new low pressure fuel pump in the tank, changed the rubber fuel line from fuel regulator to the metal piping. Switched out the ECU with good spare and still have the same, cranks for a second and dies. With both ECU i have pulse with the injectors using a noid light. If i use starting fluid while cranking it, will stay on. I am thinking its’s either injector issues or maybe a defected air flow sensor? Help!!