How do you set the timing on a 1995 Buick 3.8L

Check all fuses with a 12 volt test lite

Timing is not adjustable, as the engine computer controls timing.
Timing can be checked with a timing light, to ensure base timing is set correctly.

The timing is not adjustable on this car.

check visually for leaks on the actual shocks and bounce the car and make a judgment call there is no pre set kilometers just bad symptoms

NO THAT THE KEYWAY IS AT 12 OCLOCK AND THE MARK IS AT 10 OCLOCK.

Turn radio off, press set and move the < > butons to set clock

bad news, 1995 ford windstar transmissions fail extremely frequently at about 60000 miles, I would not waste money in a transmission flush as it will most likely not correct the problem. It is a dsign flaw, the transmission cannot handle the torque of the 3,8L engine and the 700Lbs of added weight of the windstar body.
I'd just use it untill it fails...

Most auto part stores that I have been in stock the haynes auto repair manual, I have gotten some for way back in the 70's. If you don't see them, ask if they have them.

It is not that hard. It will be time consuming. You will have to remove all of the tie downs and pull it through the fire wall grommet.