Ok--
I went to borrow a diagnostic computer today, and I cant get it to work!!!! It kept coming up Unable to communicate. I don't know what to do since my car is a 1994 RS with a 1993 Lt1, and I don't know the vin off the 1993. I figured out that the 8th letter is a "P" for the Lt1. But I can't figure it out!!!

CAN ANYONE HELP

Thanks
Chad