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Did you replace all 6 ignition coils??
Did you replace the intake gaskets??
Inspect the PCV valve and hose for vacuum leak??
Inspect and clean IAC (idle air control valve)
Does it still have a misfire??
After it stalls, will it start right away??
Let me know your results.
Make sure you have also replaced the fuel filter. If it runs on alternative fuel supply, you either have a lack of fuel flow or the injectors are shutting down.
You will need to there injectors of pulse by using a noid light. Connected to each injector, this flashing noid light will tell you if the computer is opening the injectors.
Your vehicle has 3 cat. conv. Both exhaust manifolds are cat. conv. also. You can remove the front O2 sensor in each manifold and start the vehicle. If it runs, that will tell you the front cats are plugged.
Please let me know if you have any additional questions. Thanks
Thanks for the accept. Since your fuel pressure is within spec, I would suspect the rerulator is fine.
The fuel system consists of the following
The engines are equipped with sequential multiport fuel injection that is supplied by a new returnless fuel delivery system (RFS). The powertrain control module (PCM) is able to maintain constant fuel pressure by varying fuel pump module (FPM) output. This is accomplished by increasing or decreasing voltage supplied to the tank mounted FPM. The RFS offers improved economy, lower fuel temperature and decreased fuel vapor in the tank.
FUEL RAIL PULSE DAMPER The fuel rail pulse damper located on the fuel rail reduces fuel system noise caused by the pulsing of the fuel injectors. The vacuum port located on the damper is connected to manifold vacuum to avoid fuel spillage in the event the pulse damper diaphragm were to rupture. (The pulse damper should not be confused with a fuel pressure regulator, it does not regulate fuel rail pressure
FUEL PULSE DAMPER REMOVAL
NOTE: Lubricate the O-ring seal with clean engine oil.To install, reverse the removal procedure.