I was going along the highway, in a bit of a sad mood because my car was about to rollover to 100k. I know this is silly, but I'm weird. So I'm like 'ok lets have a good time before we get to old age girl', and I start picking up speed. I get going maybe 150k, and then I start up this long hill. While going up it full throttle, my car started to lose speed, even as I was trying to go fast. My question is, does this mean there might be something wrong, or do cars sometimes lose speed when fighting gravity?