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On the underside of the actual hood, open the hood, look up at the metal underside. Most cases people are searching for theses labels in regards to EGR problems, the Ford egr code is very misleading, check your IAC valve for correct operation, but I would just replace the oxygen sensor first that is usually the cause of the problem.

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Q: What is the vacuum diagram on a 1990 F-250 351?
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Yes


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