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Red hot is the best clue. I suspect a bad converter. Try disconnecting the converter and run to test. Look inside the converter to see if it is clogged with melted stuff or carbon. Bad gas in tank? How could it possibly run well if this is true? Clean tank and use fresh fuel.
Carol Ann, Your catalytic converter is plugged up [restricted] This is causing the exhaust to get red hot and causing the reduction in power. You need to replace this part [$$$} The catalytic converter failed because you have been driving the car for months with the fuel mixture excessively rich. You need to find and fix the cause of the rich mixture or your replacement catalytic converter will also fail in a few more months.
If the cat is cherry red as you say it is I would check the firing order or timing they may have crossed plug wires this will cause the exhaust manifolds to get red hot and glow let me know if this heled you and good luck.It definitely sound to be timing related or crossed wires.
Your Catalytic converter had gotten clog up, to much gas not enough air, will get RED HOT, need to have it check out, it will happen again if a piece blocks the out let again, due to the inside of it is broken.
Is your vehicle a turbo diesel? or if it's petrol, again does it have a turbo?.... The turbo can often cause the effect that your explaining, regarding the orange glow from the exhaust manifold.... To give any more advice, I'll need more info from you....Example: do you live at a high altitude?.....The type of engine?....Any modifications bolted on?.... When did the idling become too high, was anything done to the carburation around that time?
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