ANSWERS: 4
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Flashing means there is a really bad misfire that will damage your catalytic converter. DO NOT drive it anymore and have it fixed immediately.
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What make of car is it ?
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flashing means "needs immediate attention". does the trembling get worse the faster you go? If so, probably a vacuum line. tell the mechanic to check that with his eyes before he hooks up the machine. It'll save you 50-60 bucks if thats the problem. the vacuum line should be under 10 and minimal labor.
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Misfire. One of your leads is loose most likely. With the car OFF open the bonnet and push the spark leads firmly on. If that isn't it, it might be a distributor thing.
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