What is the first thing to do for rough idle on the 3.5?
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What is the first thing to do for rough idle on the 3.5?
My expedition is smooth as silk, the F150 isn't terrible but noticeably rougher during idle. I've done some searching, but it doesn't seem like a consensus on what to do first? I have under 30k on the 2021 truck. Plugs first? Fuel system cleaning?
