I took my 1989 S10 4.3 for its NY State inspection today and she failed. The Shop said it was burning way too rich. They said it may have a bad cylinder.

Before I went for inspection I changed the oil, air filter, PCV valve, cap and rotor. It seemed to be running so well that I did not do the plugs,spark plug wires or timing (which have not been checked in awhile).

After I take care of the plugs and wires is there anything I can do to make sure she is running well enough to pass the emmissions test. I tremble at the thought of not having her pass a second time or maybe even worse, having the shop rape my wallet and still not get it to pass.

Thanks

Check the compression while you have the plugs out. This should reveal a weak cylinder

This article is something to read and consider as well
http://www.timebomb2000.com/vb/showthread.php?t=143848

Give it a good highway run as well.

Other than that I really can't recomend much. I haven't had to go through a polution inspection place in over 10 years

Good Luck