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A vacuum leak at the EGR valve or at the base of the carb, also check your PCV. Try this; Take a can of wd 40 and slowly spray it around the areas that are suspected . If the idle improves for a moment this is probably where the problem is. Check around the carb base as some Fords of this vintage had their share of problems with leaks.

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โˆ™ 2011-10-18 21:10:39
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Q: What might the cause be of an uneven idle with a slight surge at stops be on a 1985 Ford e150?
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