bad fuel pump or no gas
that would probably be the transmission. It may not qite be working right.
gravityGRAVITY
gravity
An avalanche
egr valve
It causes them to stay in their containers if not tipped over, and to run down hill if they get out.
Your gear linkage is offset!! Or you are on a steep down hill
Gravity.
a wheel barrow
i whent down the hill.
Either the friction or density of the snow.
If there is snow on the hill a sled or toboggan can be used to ride down a hill.