Hey guys. I drive a 2005 srt6 auto with 65k under the hood. Recently I've been having issues and for the life of me can't seem to hunt the culprit down

Symptoms are car will start and run like a beast cold and after warmed up. But if I park and say run into the store and back out upon starting my engine starts up fine but then acts as if it's choking. I have the tiniest amount of throttle response and pedal goes dead after that. Car barely stays running and is hardly drive able unless you creep it along. I also notice a lean smell from the exhaust. If I let my car sit and become cold it will usually crank back up and run normal for a day or so. If I manually press my throttle body while symptoms are present it catches it's breath idles high. But still I have no response from my gas pedal. I have changed coil packs spark plugs and wires. I have changed my cps. Completely cleaned my throttle body. I habe checked for vacume leaks. The front 02 sensor were changed 8 months ago and the rears get swapped this week. Any advice would surely be appreciated. It seems I can't get it to throw a a code even after letting it stumble and sputter for 20 min tryin to get it home