I was returning home from a classic car show in spokane Washington in my 1967 Mustang. It was about 8:30 at night I had just passed Plummer idaho heading south on highway 95 when off to my right I noticed a long cigar shaped object hovering in the air it had three blue lights at each end. I slowed down and was about to pull over to get a better look at what I was seeing when it appears to move toward me. I speed up and the object then speeds up as well I slow down. It does the same. Always remaining parallel with me. I then accelerated to about 125mph it was still there then a few seconds later it accelerated away from me on a westward heading at very high speed. I then slowed back to speed limit. The unsettling part of this encounter is that it's about 1 1/2 hour drive from spokane Washington to my house in Moscow idaho. I left spokane at 7 pm and clearly do not remember stopping at any point on the highway but it was 1:30 am when I got home. So there is a approximately 4 hour gap of time I cannot account for.