Good Shop in Central Cali

Seems an older smog place could hook up the sniffer and tell you if you are rich/lean at RPM's? Catch them on a slow night....Remember those glass spark plugs that showed you the color of your combustion? You matched the color to the chart and it told you if it was rich or lean...? http://www.autoexpertproducts.com/colortune-14mm.shtml

[ame="http://youtu.be/xEZ0-uN0NA4"]glass colortune plug[/ame]