I do have your pdf file and it is very nice work thank you! Just not sure where to put it right now since it covers Memcal type ECM/PCM...
Sure sounds like "IAC Command speed open loop offset" is an idle RPM setting for open loop. You can easily see if system is going Open Loop when the idle issue happens in data.
O2 sensors cooling off in headers is a common problem. Most narrow band O2 sesnors work the same whether heated or not, just the heating element is added. For GM a heated replacement can be from many vehicles, the only difference would be the connector. IIRC a 1995 Chevy truck and 1995 LT1 engine are the same and a good place to get one ordered from. Then add a rely and wiring for the heat circuit.
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