There's no way a digital mutimeter sampling rate is high enough to make sense of things when the engine is running. You either need an analogue meter or an oscilloscope to accurately measure anything.

Were you trying to read voltage or resistance?

Low or high tension side?

Since you're down by the coils, check that the spade connectors are nice and clean with no blackening or corrosion. They have a tendancy to open out a bit, which makes for a bad connection. Clean them up with a bit of sandpaper and if they're too wide to firmly grip the terminals, close them up GENTLY with a pair of pliers.
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