She runs lean and won't turn over 3100 rpm. what's wrong?

What is your question?

the car has 68k on it. I bought it from police impound. it had sat at least ten years. it has allways ran lean and wouldn't turn over 3100 rpm. I have replaced the pressure regulator, the pump , and the filter twice. car has never been wrecked. lines not pinched. I'm thinking the injectors are clogged. is this a possibility? if so can I rebuild them?