I've got the listed car in with an issue that it is missing at idle just every now and then. It is not frequent enough to set the check engine light. Using the Autel unit I am trying to determine which cylinder is missing by compairing adjacent cylinders "true running" reading. Seems that #4 spikes out at the exact same time it happens. Also, it seems that #5 cyl and #3 cyl spikes down at the same time. Can this be used as an indication that it is for sure the #4 cylinder that is missing?

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Jim