Throw that narrowband AFR gauge in the trash................Wideband is the only AFR gauge anybody should buy.


As far as your vacuum/boost readings go it looks like you might have a small boost leak. Did you remove the intake manifolds ever? Most cars(all that I've owned) read around -16 to -18 at idle and during cruising.....................and the MOST boost I have ever seen with my 185 pulley is 18.9psi(which happened only once) to date.