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P0021 and cant fix it. Please help
2010 Expedition. First had a code for #4 coil. Changed all coils and plugs. Code went away but p0021 appeared along with a rough idle. Has progressively gotten worse and now idles rough, shakes and struggles uphill and jerks at higher rpm. Changed oil and filter, new VVTs on both sides, also...- traceface1086
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- Replies: 5
- Forum: 3rd Gen - 2007 - 2017
