1994 Nissan 300zx with low compression in one cylinder what is the recommended repair?

What's is the compression in the cylinders? I'm having the same problem right now in my 90. I'm getting 165 in 5 of the cylinders, and 150 in one. The local Z shop said it was no big deal, and that you can allow up to 14 or so psi difference (especially if the car is 20 years old). If it's more off than that, I would recommend you take it to a mechanic. I know it could be a lot of things, normal wear on cylinder walls, worn piston rings, or a head gasket, etc.