Engine running rich

You either have a bad catalytic converter causing too much back pressure or you are running rich. I think cylinder 3 and 6 are on the same side of the engine (except opposite banks) right? Locate the fuel pressure regulator. Is it on the same side? I've seen those go bad and allow fuel to be sucked into the vacuum line causing a rich condition/ misfire on two or three cylinders on that side of the engine.

2 things come to mind. a plugged catalytic and the engine is running too rich and the convertor is trying to burn off the excess fuel.

it sounds like the catalytic converter is clogging up also if your car is running to rich the converter will over heat.

cat is blocked replace

You do not mean cranking,the starter turns
over the motor,that is cranking, is it not

You mean it doesn't start,that is a NO Start Condition

Lets use common sense here

You didn't need to ask any questions here
because the exhaust converter gets red hot & the
car is not only unuseable but overheats

Your looking at at least $1000.00 to diagnose &
resolve many problems

The converter is 14 years old & if it wasn't red hot,
it is time to replace it

It is hot for several reasons,you did not say what motor is in there

The timing is most likely an issue

Also you can not replace the converter until you replace
the spark plugs,get rid of any cylinder misfires,rich fuel conditions,fix fuel trim,& such, all of which along with timing
& I mean serious mechanical repairs, have attributed to ruining
the converter,oxygen sensors,all of them, from the heat
& the list goes on.

Lot to have checked out & you can't do it in your driveway
with no experience & no professional test equipment

A rich fuel mixture will cause the catalytic converter to run hot. A plugged catalytic converter will cause the engine to run poor but not overheat normally

Catalytic convertor fails due to oil burning, recent head gasket, improper fuel control,but plugging up at 3000 mile misfire surely plug it up when the vehicle is dumping gas in the catalytic, lean misfire ,running very rich due to a coolant temperature.Who is putting this on?I dont know what state you are from,a catalytic should not be installed unless the vehicle is in proper fuel control.and whoever installed this should foot the bill. You need to claim warranty regardless and plus there is a EO# that must match the vehicle.

Replace the O2 Sensor and if that doesn't fix it your going to have to start replacing the stuff Identified by the codes. Most likely the Catalytic converter is bad and the Crank Position sensor. If the Crank Position sensor is sending faulty signals then it will cause misfires, the O2 sensor causes the motor to run rich, the Catalytic converter will become overheated if your running too rich or it is damaged or partially blocked.

engine is running rich. Some reasons might be MAF sensor or computer. Is the engine light still on, or what are the codes you got from the previous scans?

Your catalytic converter is bad (plugged or collasped). Do not attempt to drive anymore. Ya need to get this replaced!