Sounds like you replaced alot of parts you can try this.
1. Verify the Electronic Control Module (ECM) has good powers and grounds.
2. If the engine runs better with added carburetor spray, check for 10-14 PSI with the engine running.
3. Check for a stuck open Exhaust Gas Recirculation (EGR) valve.
4. Verify the Idle Air Control (IAC) motor retracts for a fast idle start up flair with the Key On Engine Off (KOEO).
5. If the engine stays running with the set timing connector disconnected, check for a weak distributor pick up coil output.
6. Disconnect the distributor pick up coil connector from the ignition module.
7. Verify the AC voltage output from the pick up coil is over 700 mV at a FAST cranking speed.
8. If not, replace the pick up coil and install a NEW distributor shaft