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Q: Rough Idle, Check Engine Light On on 1997 Ford Taurus

I have a 97 Taurus, given to me by my mother. The engine was rebuild only a few years ago. Recently, the alternaor died, giving of and electrical burning smell. Replaced it, and works fine. Now the Service Engine Soon light is on, and when I start the car from cold, it barely catches. It rund really rough until it warms up and there is zero acceleration, again until it warms up. The problem feels like a plug not firing. I replaced the plugs. It now runs better sooner, but still rough. I replaced the distributor assembly, but still the same problem. When running I can achieve normal driving speed, but when revving in idle, it won't rev higher than 4K rpm. When it reaches 4K, it starts to bog a bit. What might be the cause of this?
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Diagnosing the cause of your service engine soon light coming on may help lead to the cause or the driveability concerns with your 1997 Ford Taurus. When the engine control computer detects a fault in one of its systems a fault code is stored and the service engine soon light is illuminated. Reading and diagnosing any fault codes stored should be the first step in diagnosing any driveability concern.
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