I found another site that had excellent information regarding the EEC IV tests and code outputs. Check out this site:
http://www.dalidesign.com/hbook/eectest.html
It sounds like you just retrieved the memory codes from the EEC with your scanner. Unless you performed a KEOR (key ON, engine running) test then pressed the accelerator within 2 minutes after the last code was output, you didn't run a cylinder balance test. For this test, the engine must be running while the EEC cuts one cylinder at a time and checks the drop in engine rpm.
You may want to just use the jumper method and watch the blinks of the CHECK ENGINE light as described in the link above.
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Scott
1991, 254K miles, glass hood, police grill, SVO shifter, Catz fogs,
K&N, 73mm MAF, Superchip, PP Y-pipe, Borla cat-back, 190 lph pump
Eibach/Tokico/polyurethane, SHO Shop front & rear strut braces,
16x7.5" Moda R1, 225/55ZR16 Bridgestone RE730, -1 deg camber x 4,
6 disc CD, Class II hitch, Silver award at SHOklahoma Car Show
[This message has been edited by sdpatt (edited 01-14-2002).]