Transmission?

Gear shift shifts without putting brake on. Is this normal?

engine will keep running once key is turned off for about 2-3 seconds and then stop.

transmission stopped working. Changed filter and fluid.(I did myself and adjusted rear band). Now works, but when vehicle is stopped (when going forward). The transmission seems to go on vacation and after pumping gas pedal and a few seconds, the transmission kicks in and peels rubber. Nearly. Seemed to drive fairly normal down road. But was afraid to drive to far from home and not be able to get back.

I have had this to a mechanic for gear shift without pressing brake and "dieseling" and spent lots of money and was not fixed. They said there was a short (which supposedly they fixed) and the shifting without pressing on brake was normal. Sounds dangerous to me.

Since I have already put a lot of money into this vehicle, replacing engine, wrong mechanic, etc.I will be glad to donate for some good sound advice. And more if fixes problem.

thanks
bob felts