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Check your pcv hose behind the intake manifold for cracks or cave in at the elbow. My 2004 zetec se with 155000 miles had a smashed elbow and a 1.5" long slit in it causing a rough idle and check engine light. I would also recommend the gates timing belt kit. When I did my timing belt I also purchased a water pump and thermostat housing. Advance auto had it in stock with a lifetime warranty and you can find good coupon codes online. The last thing I would recommend is that timing belt special tools. They can be found on amazon for a little over $20 and that makes the job much easier. Good Luck.
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