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Q:

where is the idle bypass valve located on 1999 Mercury Mystique

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
idles fine but backfires and chokes out at acceleration. usually around 2000 rpms
(1) Answer
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There isn't an idle by pass, and that wouldn't be the problem. Idle speed is electronically controlled. It could be ignition or fuel related but impossible to say without doing some basic tests or being able to experience the problem first hand. There is a company that independent auto repair shops buy their information from that the same information inexpensively to do it yourselfers. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
Information found on Alldata may help you get to the source of the problem.