Just wanted to post a quick update :
I don't know how or why, but I changed out the IAC with the spare one that I had and wouldn't you know it fired right up like nothing happened. Back to running great again.I still don't know what would cause the IAC to go bad by changing bulbs, but I did read somewhere that LED bulbs can give off RF interference and they also send pulses and signals. I don't really know much about it but maybe the IAC was somehow affected by that? Who knows but all good now. Thx again.
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1973 Firebird Restomod
468 c.i. 4spd.
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