slipping

motor starts to slip around 1500 rpm, either at low speed or going up hill. Does this similarly at high speed (65-75) when in overdrive around 2000 rpm. Rmps jump up and down, and the vehicle feels like it is having trouble. goes away if you give it some gas. Occasionally stalls when backing up...

I have a 2000 park ave and I had a few issues recently. Driving it started to make some odd noises and thought I had a coil problem. I had a friend mechanic come over and he checked everything and the coils Drove it the next day and got halfway down the street and it stopped going. Pushed it...