I'm not sure if I'm just being a noob at driving, or if this is legitimately a problem.

My car has been able to do 0-60 runs by holding the petal to the floor, however the transmission switch (PNP i think) went bad. It was replaced incorrectly the first time and was replaced a second time which then seemed to function fine. A few days ago I was speeding up to go onto the freeway and it got stuck in gear, I released the petal, it shifted, and I kept accelerating. After the freeway when I accelerated, around 40 the car jolted and the check engine light came on, I checked the codes and they were codes (5-3-2 and 4-4-5 from terminal A2 which I read was the transmission) After resetting the codes the check engine light went off.

I've been much more cautious driving it but decided I should probably find out what is wrong, so I found a secluded street and filmed 0- where ever it got before I had to stop. Below is the video, it accelerates nicely until about 20 miles per hour and then seems to get stuck shifting to second gear, although I could be wrong.

http://www.youtube.com/watch?v=9RwlnF8-Dws

As you can see the car gets stuck at about 4000 RPMS and then the check engine light comes on, the car was warmed up before the run.

I may also note that the turbo's "hissing" seems to be much louder and more of a blowing sound.

The car is a 1995 850 turbo, and the run was done in sport mode.