Ignition/Distributor Engine Speed Input Circuit Malfunction

The engine computer is not receiving a proper speed signal from the ignition system or crankshaft position sensor, which it needs to control spark timing and detect misfires. This is usually caused by a wiring issue, bad connector, or failing crankshaft/camshaft sensor. Without this signal, the engine may not start, run rough, or stall, so have it diagnosed immediately.

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