YOu'll get a 'misfire code' which is:
P0300 general misfire (from memory)
and a P0301 for cyl 1 or P0302 for Cyl 2 etc.
There is not specific code for a coil because misfire could be caused by plugs, leads, coils, injectors.. a few things..
just the coil is a very common weak spot on the JTS.. and the symptoms you've described perfectly describe my experience when it happened to me, on 3 separate occasions.
When you get the reader, work out which cylinder is causing the problem, and swap the coils around.. see if the misfire follows the coil, if it does, you have a dead coil, if it doesn't.. then it might be a plug, or an injector...
I'd also recommend downloading MultiECUScan http://www.multiecuscan.net/
and buy a cable from Rarebear on here or ebay.. it's designed for these cars and far better than a general reader... you can also get real time data from the while its running..