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You have a pressure port test on the fuel injector rails,when you stall out just cycle the key go to the test port and which is nothing but a tire valve looking,press in the shrader fuel should squirt out and just dribble out,if it dribble out you may need a fuel pump, now as for the catalytic convertor you would be complaining about no power.I beleve you dont have a plugged convertor, You are equipt with a map sensor on the under hood diagram follow the hose diagram and check to make sure this is plugged in.If anything I stating the ignition module as the culprit it is designed with a 3x reference signal,which is not calculating the proper engine speed,and it doesnt have to set a code
At an idle, no car should have a red hot exhaust manifold. If it does, this could indicate a clogged Catalytic Converter. or a o2 sensor thats bad. I would not drive it until it gets fixed. convertor, timing, etc, just get it checked out! good-day !
I would check to see if the vehicle has any stored codes by putting a scanner to it. A cause of something like this can be catalytic convertor clogging up, mass air flow sensor bad, fuel pump bad, or fuel pressure regulator bad.
You can verify fuel pressure by doing a pressure test. If the pressure is good then the fuel pump is as well. Next crimp the soft part of the return fuel line to the tank. If the pressure rises to somewhere around 90 lbs then the fuel pressure regulator is good as well. Test the mass air flow sensor by unplugging it. If the idol improves then you know it is bad.
Check the level of exhuast coming from the tail pipe. You can compair it to another vehicle with a similar size engine meaning v6 to v6 and v8 to v8. You get the point. Also check to see just how hot the exhuast is coming out. Exhuast gases should be hot but not burning hot. If it is then its a good sign your catalytic convertor is clogging.
before we get into anything in depth, replace your fuel filter. one time while its running look underneath and see if your catalytic convertor is getting red hot. litterally. i hope its something this simple. little things like this will cause great big sounding issues in these cars. get back with me and let me know. happy holidays