1995 Mx6 V6

I'm going this afternoon to look at a '95 MX6 V6. It's in prety good physical shape, good tires, good brakes, no major rust. The guy said it has a loud engine knock but hasn't had it checked out. He said it run and shifts good and all the power goodies work fine. I'd like to know if there are any major issues with these cars and if this sounds like a good deal. Let me know soon.

What is he asking? explain the knocking sound as well, maybe i can help