Rough Idle
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Rough Idle
I'm working on a 1998 Expedition with a 5.4. I have lean codes and intermittent rough idle. I've replace spark plugs and fuel filter, checked for vacuum leaks with a smoke machine, and the fuel pressure is within specs. I used my scanner to check cylinder balance test and it show miss-fires on every cylinder and a pattern of miss-fires shows up. after about 5 minutes of watching I can predict which cylinder is going to miss-fire next. Can anyone give me an idea of what could be causing this condition?
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