Hi,
Based on your description, it sounds like you are on the right track. It sounds like you have a weak fuel pump. What needs to be done is to check fuel pressure. Here is a link that explains how in general pressure is tested. You will need a fuel pressure gauge. I realize that isn't something most people have, but oftentimes, a parts store will lend one to you.
Here is the link:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Here are the manufacturer's specs as far as fuel pressure.
2006 Chrysler Pacifica V6-3.5L VIN 4
Pressure, Vacuum and Temperature
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Specifications Pressure, Vacuum and Temperature
PRESSURE, VACUUM AND TEMPERATURE
FUEL SYSTEM PRESSURE
400 kpa ±34 kpa (58 psi ± 5 psi)
Let me know if this helps or if you have other questions.
Take care and God bless,
Joe
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Tuesday, February 2nd, 2021 AT 6:13 PM