Also check the wire from the coil to the distributor and the wire from the crankshaft position sensor to the ignition control unit. They pass thru areas that are subject to high heat.

One of the pins from the coolant temp sensor ends up at the ignition control unit. Make sure this signal is arriving at the ignition unit. Though I dont know how a loss or a wrong signal could completely take the spark away.

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Saumil S. Patel