I have a 93 lude with a h23 in it with about 170k on her. I was throwing a code 43 right before my car shut off and died. I know this code deals with the fuel system and it must be either the injectors, o2 sensor, cat, fuel filter or fuel pump. At first the symptoms were that from the rpm range from about 2k- 4k my car would not respond very well to the throttle and just bog out and be very hesitant and then at 4k all the sudden she would pick up and start accelerating normal and drving good throughout the rest of the power band. Eventually this led to my engine just shutting off on me while i was driving. After being stuck on the side of the road and not able to start my car for about 20 min it finally started and i was able to get it to a friends house nearby. Now it won't start at all. When i try to start it cranks but never turns over. Any ideas as to what i should replace first in attempt to fix this problem?