Cylinder 1 misfire...again?

Ok..I have a 96 pontiac firebird..v6, 3.4 cylinder. I've got a reading from the OBD-II still saying cylinder 1 misfire even after I've replaced alot of parts. I've replaced the fuel pump, the fuel filter, 2 of the O2 sensors, cleaned the fuel injectors and replaced the O rings, I've also replaced the ignition coils, the spark plugs and wires, the ignition module, and the air filter. I've also replaced the compressor for my air conditioning and of course the belt as well. What more could possibly be wrong with my clunker car?!?!?