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Normally one finds the most obvious sign is a rougher than normal idle. I have a 2000 Mustang and found that occasionally the idle was rougher than normal and sometimes the car seemed to have less power. Again, this was occasionally and became worse and worse over time. I replaced the EGR and cleaned out the intake manifold passage to correct the problem.
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∙ 16y ago
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What are symptoms of bad valve lifter?
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