2010 Challenger RT

When I leave it sit for a couple weeks it will crank but not start. We try a few times with no luck. Finally this last time I pulled the air intake off the throttle body and grabbed a can of carb cleaner. Told my wife to crank it and before I had a chance to hit it with the carb cleaner it fired up and ran fine. She drove it to work and when she got home she started to back in the driveway and it stalled. I went out and hopped in and tried it with no luck. I put it in neutral so we could push it back. I decided to try one more time in neutral and it started right up. Started this morning and she drove it to work no problem.

Any ideas on where to start looking? No check engine light or any other lights are on.

Fuel pump getting weak, check the pressure. That's my guess

Going to second this as an easy start diag. Also, next time it sits for a week or two, key it on ignition without your foot on the brake and let it build full fuel pressure. If it starts with no issues then, pretty sure you found the culprit.