nope no time machine sorry..... ussually an intermittent sensor would be caused by an exposed wire that shorts sometimes or a loose connection.... or maybe a resistor that is heating up and shorting out when it gets hot.... the pressure regulator was a trick that gm was telling mechanics to modify if experiencing problems similar to yours, they told us to tap an indentation into the regulator with an 11/16 socket to crush the spring a bit and keep the regulator open just a little more..... its not in any books, but mr goodrich gave us a memo about it