Yeah, I understand that, but if there were, say, 5 PSI due to backpressure from the return line, it doesn't seem like it would make any difference. If I'm keeping 11 PSI at idle, when the least fuel...

I tried this procedure and when the A/B pins were shorted the IAC made noise and never stopped. Just kept sort of buzzing. Well, I didn't wait forever, but 30 seconds or so. Should it take a long...