The AFM on my N/A 280ZX has 2 air bypass screws, one on either side. Which one do I use to adjust the CO. All the books and references I have only show one screw. Any ideas?

 

What is the problem? Can't pass emissions?

I would usually say to leave the AFM adjustments alone. If the AFM is messed up, replace it. First check other areas to fix mixture problems. Have you replaced the oxygen sensor yet? Only $30 or so...

 

No emmision control in South Africa. S/African 280ZX's don't have O2 sensors. I wanted to make sure the car was in "tune", as I moved it from about 5500ft above sealevel to the coast.

 

If you drive it to the coast, you should be ok. If you tow it, you may encounter a problem...not likely since your dropping elevation. It's going back up where you'll have fits.