Intermittent problems are a PITA.
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I have a very basic scanner tool, it does not report any codes at the moment. I think I will have to suck it up and get myself a Tech2Try hooking up your scanner and log live data a few times while driving it. It may show some errors to lead you to a conclusion where to go next. By live monitering fuel and ignition an intermittant code that doesn't hard set may show. Or even graphing parameters may show your hiccup. Depends on scanners abilities. Good Luck!