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Q: I have a 2000 Taurus with a 24 valve dohc engine and it is missing. on 1998 Ford Taurus

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the engine misses at idle and when you put an AC load on it.
(3) Answers
Do you have a check engine light on? If so, post code on here to help us assist you. It sounds as if you have an intermittent firing problem which can be a spark plug ignition coil or the plugs themselves. Need more info. please.
I have the same problem. AC load makes the engine idle rough worse. Took it to a shop. Found out more than likely I have a sticky valve in the engine. Possible you have the same problem. I had all the possible vacuum issues checked all passed.