Hi,
Since you are getting lean mixtures, chances are either you have a vacuum leak (which you have checked), low fuel pressure, or even an exhaust leak before the catalytic converter.
First, here is a link explaining how to locate a vacuum leak:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Next, here is a link that shows in general how to check fuel pressure:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Here are the manufacturer's specs for fuel pressure:
2007 Dodge Magnum V6-3.5L VIN V
Fuel System Pressure
FUEL SYSTEM PRESSURE
400 kpa ± 34 kpa (58 psi ± 5 psi)
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Let me know what you find or if you have other questions.
Take care,
Joe
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Sunday, March 21st, 2021 AT 7:42 PM