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

the engine misses at idle and when you put an AC load on it.

Asked by for the 1998 Ford Taurus
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.
2 more answers
check plugs wires dis and so on
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.