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When a car is put on the machine and it reads random multiple misfires, what could be wrong ? Could it be the engine control module bad?

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When the car reads random multiple misfires, it means that the car has various diagnostic problems including faulty spark plugs or wires, defective coil, defective camshaft position sensor and defective computer. It will take a mechanic to help you determine where the real cause of the problem is. If there are no symptoms, the best thing to do is to reset the code and see if it comes back.

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Could be, but more likely valves or fuel injectors, possibly ignition coils...

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