well Gilly the car would not start with the newer tcm, had wrong vin in it.

Since carsoft has a provision to recode the tcm, I tried to recode it only to find out it has to be unlocked to be recoded.

So I reinstalled the old one and reset the learn on it.

BUT, while I was doing all this the cooling fan started to run continuously with the key on, and also now it idles very low and will stall .
It drives fine and shifts fine, infact it shifts better now that the tcm learn was reset.

what do you think happened?