RE: Precise ILS procedure

THANK YOU ALL! Great advice!Just expanding the issue:Assume that I'm flying the final leg to RWY 34R, which has no ILS frequency. To do this, I turn on BACKCOURSE button with A/P ON and NAV1 tuned to ILS freq of RWY 16L. Altitude is 3,000ft AGL. I intercept both localizer and glide slope but when i am one half mile from the airport the BACKCOURSE turns off and i loss some altitude and the plane speeds up with nose up. This makes me crazy after a two hour smooth flight and I really don't know what to do. The same happens even when i can intercept the LOC and GS on ILS freq-provided runway (i.e., direct APPROACH without BACKCOURSE). I LOSS ALTITUDE, that is the problem.May be this will clarify the issue. Which buttons should be ON and which OFF? Thanks again.BINA Bina