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If you don't have any codes stored I'd start with a basic tune-up. Stumbluing at part throttle is also commonly caused by a stuck EGR or PCV valve that causes a basic vacuum leak and they won't throw a code.
Plug the hose between the ERG and the relay ( golf tee works nicely ) so that the ERG is blocked off. See if that helps. Also check the PCV valve is working properly.
Yes, you will always see some spark retard.
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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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