1993 Jeep Cherokee Jeep wont stay on

My jeep sat for 6 months, so the battery died. I bought new battery and jeep has trouble starting, I replaced cap and rotor, replaced spark plugs, spark plug wires. I removed throttle body and cleaned it, along with the 2 sensors attached to throttle body. The jeep still has a hard time starting, and when it does it will only idle for about 15 seconds and then rattle out and die. If I give it gas sometimes it dies right away, much sooner than the 15 seconds. Other times when I give it gas the rpms will raise up, I hold accelerator at 3000rpms for about 3 seconds, but then it will decline back on its own until it dies while my foot is still on the gas.