At first my eyes saw 'different handed laptop' which got me laughing, since, that may well be their next suggestion.Used Holley's ideas about trying both a different handheld and the laptop with no success
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I'm still somewhat impressed by you keeping with it, although, given the blazers status as the high horse flogger and the Monte being a cruiser, I'd have yanked the system for a non-ccc carb setup by now.