neighbors 79 1/2 ton failed emission

Before going to all that, check those pesky basics. Timing, vacuum leaks, plugs, wires, cap and rotor, especially rotor and given its age, I would probably do a compression check. also given its age the cat could be tired. Post what his readings were, Things learned from Florida's now defunct Emission testing, make sure the vehicle is at operating temperature when its checked, don't run the ac while waiting in line, and don't shut the engine off while waiting.

Whitelightning