There is a test valve on the fuel rail for the injectors. You need to
have between 40 to 80 PSI at point.
Your problem could be anything from clogged fuel injectors, bad
injectors, no injector pulse, a bad coil module, a bad fuel pressure
regulator, or even a bad ECM.
First have the fuel pressure tested at the fuel rail. Then have one
of the injector connectors pulled and checked for pulse. On the style 2.8
V6 you have, 1 or 2 injector harness connectors can be accessed with out
removing the upper intake. If you have pulse, then the coild module is
most likely working correctly.
From there you need to have your ECM read with a scan tool, not
just flashing the codes. A scan tool can view the readings the ECM is
getting, not just point to a circuit that has an issue.
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