I installed a 1990 Mustang 5.0 into my 1968 Ford Bronco back in 1994. The car has always run very well. It starts instantly. Recently the car sat for a very long time. Perhaps a full year without starting and probably 1.5 years on the fuel in the gas tank. The gas tank is new since 2008 along with fuel filters and fuel lines. Anyhow when I started using it again, it started just fine albeit a bit smoky and such but it started and drove for a few days. Then it began to have a difficult time starting one day and once started it was running rough. It did run, and I parked it in the garage when I was done that day. The next day I could not get it to start. It seemed to "catch" once in a while, but never run. I figured a clogged fuel filter, so I purchased and installed a new filter. No change. I removed a spark plug and confirmed that there is spark. I got a code reader out and it gave me: (81,82,85/66,95). I saw mass air, which made some sense, so I purchased a new mass air sensor, and no luck. I'm not sure what step to take next in troubleshooting. The most recent code reading after the mass air had all the same codes but 95 is not on the list any longer. Car still refuses to run, and just barely tries to "catch". Just running the starter endlessly.
Could my injectors be completely clogged? Could I have lost the processor?
Any advice and direction would be appreciated. Thanks in advance.