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At this time is the scan tool power balance test picking up any misfires or cylinder not contributing equally?
Are there any trouble codes stored?
So when you ran those test it still was misfiring but there was no computer/scan tool proof of it?
Did anyone monitor TCC or TCCSLIP or compare TSS to RPM?
This misfire does it feel like the vehicle has random hiccups or is it just a short set of vibrations lasting under 3 seconds?