93 Buick Roadmaster runs fine when cold after warming up stalls and backfires upon acceleration replaced map sensor egr vacuum solenoid fuel pump fuel filter temperature sensor plugs and wires?

The stalling and backfiring in your 93 Buick Roadmaster after warming up could be related to several issues despite replacing key components. Check the ignition system for faulty coils or a malfunctioning ignition control module, as these can cause problems when the engine is hot. Additionally, inspect for vacuum leaks or issues with the fuel injectors that may not show symptoms until the engine heats up. Lastly, consider the possibility of a failing crankshaft or camshaft position sensor, which can also lead to these symptoms.