Heater coil
yes, if the Cadillac converter is not working properly it can cause you to loose power and may in the future cause you to loose your engine.
There are several things that can cause your Cadillac Deville to have transmission problems. The most common transmission problems are worn transmission gears.
My first diagnosis would be a blown freeze plug, check that and you may find your problem.
There is a bad or damaged ground to the the ECM
Absolutely
O2 sensor, and catalytic converter can be ruined. You can also cause internal damage to the engine, depending on what the problem is. Have it repaired.
dirt in the speed snsor bad speedo head in the dash
1 or more out of balance tires
A bad resistor or a bad switch.
One reason a 1998 Cadillac Deville would cut off while driving could be the fuel pump or the car is out of fuel. Another reason could be the spark plugs.
defective oil pump thinks idle is too slow,so switch opens to protect engine.
There are several things that can cause your 2000 Cadillac dashboard lights to quit working. The most common cause is a blown fuse.