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Hi re 1990 nissan pulsar with no spark.

I have put another ecu unit in, plus another dissy module, i have sprayed all wiring & plugs with wd40, checked crank module checked all fuses, sprayed all ignition components motor turned over but still have no spark to plug leads,there is no spark to ignition coil, and i have replaced the coil, but still no spark, hope you can help, thanks, barry.

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