When the check engine light comes on does the car still run properly? Any hesitation? I chased the same condition, changed ( borrowed from a friend's car ) ECM and chip. Turned out the MAS was going bad and the condition kept getting worste until the MAS went bad enough to set a code.
Just be careful, you normally can't return electrical parts. You might be better off looking of a donor, or someone parting out car with same engine/trans.
What are you using to pull the codes? I use Diacom on 3rd gens, works nicely for reading the car while it's being driven and can check codes realtime.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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