My 1990 rx7 fc S5 ran perfectly fine before I did some work on my car. After I finished the work I went to start up my car and it started just fine but died after a second. The work I did on my car included removing the alternator and cleaning it(I put it back on the same way I found it), removing the air pump permanently as it is no longer needed, and some other minor things that are unrelated to the engine. I was wondering if someone could tell me what is wrong based in their experience or knowledge.