Thanks Yannay for the info.

Well, I'm not a pro at this stuff...learning. I do fly serveral Captain Sim aircraft, the 727, 757, others and have no problem with the ILS approach. I set-up the Flight Plan for the C-130 the same as these aircraft...select IFR for the type of flight.  The C-130 radio is set to the ILS frequency of the airport.  I select the NAV ILS mode and prior to the approach, I select the approach or glide slope button. At this point the  C-130 goes astray. On the other aircraFT...smooth, straight on  to the runway.

I'll check out the KB-417 ::)