HELP! LT1 won't idle
 

I just put a used engine in my 97 camaro LT1 6spd out of another 97 camaro Lt1 automatic it will not idle or stay running when air flo meter is plugged in. When unplugged it idles fast and stays running. The OBD11 reader shows the code for speed sensor. Does it have any thing to do with the air flo meter idle situation.:bang:
Any help at all would be appreciated