Hi
I'm brand new to this forum and had a few questions.
I recently recieved an 86 s15 jimmy with a new engine that has 64,000 miles. The previous owner was under the impression that the car was on it's last legs.

When I drive it there seems to be very little power and rpms are really high before it changes gears (sometimes pretty violently) futhermore when I start to coast it up shifts too early and I end up getting that vibration from the rpms being too low. (As if it were a stick and I just put it in 4th from 2nd.)
any Ideas?
Thanks

Welcome to AF,
First thing is fluid level and condition.
Check TV cable and adjustment.
If TV cable is hooked up and adjusted good.
Go for a pan drop and new filter and have a look at the governor.
Check plastic gear on end and for a sticking governor weight.

And also remember the engine has to be running good for the transmission to work right.