Vans acceleration is almost gone.

My van has no get
up and go. pull out
of the driveway foot
almost to the floor
and the van is just
moving very very
slowly and then it'll
kick in but slowly.
Cannot accelerate
well or go up hills
any incline is like I
need The
Flintstones to keep it
running. Decrease
power, kind of scary
on the freeway.