Well, I got ahold of a scanner, and found this: My spark advance is stuck at 39* regardless of RPM. Now, this is on my 92 Lb9, so the Ignition Controll Module is built into the ECM... is this the only thing that could cause this? Im also running lean up top and gettin knock/knock retard (16*total retard). I unplugged the computer advance wire (forget the name, im tired), and the exhaust note totally changed.
Is my ECM shot?

 

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