Ignition coil question on my 1983 W123 2.0

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I saw on another thread that a loose screw on a wiring terminal block near the coil was causing cut-outs so I dismantled mine, cleaned all the wiring O rings and reassembled them with copper grease. My terminal block screws were not loose but i decided to remove and clean the O rings anyway. They were a bit dirty but looked basically OK but the earth may have been intermittent, I couldn't be sure. The car has run fine since. But then it most often did run fine before I did that. Time will tell . . . .

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