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Rough idle? P0171, P0174? Here's what you need to check first!!!
Same codes po171 po174 po300 I had same codes show up few months ago. Reading some posts I looked for some vacuum leaks and in doing that I found a lot of gunk in one of the hoses on the left side of the engine as shown in pics. Cleaned that up and it helped a lot, but not completely smooth as...- johel77
- Post #18
- Forum: 1st Gen Ford Expedition Engine & Performance
