Been long time don’t see much talk about something I love in diagnosing engine performance is histogram for vacuum my snap on st1000 ignition scope to compare ignition firing to cylinder vacuum tell lots think it a lost art
10 years in army as auto technician and instructor all equipment from tanks to trucks , 14 years certified Gm and Cadillac tech speclized on performance, and independent shop owner 35 years
Work on Honda goldwings motorcycles and ride Goldwings for 35 years
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