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Misfiring in a car when it is cold can be caused by several things. The mist likely causes are a bad head gasket or a leaky fuel injector. Either of these can allow fluids to slowly mix overnight and the car will misfire until the excess burns off.

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Q: What causes misfiring at startup Car runs fine after it warms up.?
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What causes low idling smelly exhaust and a shaking car that almost stalls for the first few minutes after startup and then runs fine this only happens a few times a month?

Leaking fuel injectors. Catalytic converter... i had same problem. smells like rotton eggs right?


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