Gentlemen:
I have a 16197427 ECM running a 350 Vortec. The RPM at idle when warming up varies according to retarded to ATDC IGN timing, BPW, IAC wherein monitoring the WBO2 goes from 12-13 to near 20:1 AFR and then the ECM and engine recover and then it does it repeatedly. Is there some explanation of the engine parameter interactions on the part of the ECM reactions? Trying to sort this one out. Need to disable some parameter to help sort this out? Need help. Please advise. Thanks.
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