Why does 3.0 l idle runs rough the fine at higher rpm?

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Vehicle is '98 ford ranger, 3.0 L, ... to be much higher resistance to have such a rough idle. ... been running fine and then all of the sudden it's as rough as a ... - Read more

My 05 6.0L runs rough when cold. 6.0L ... 3.7,3.5 3.0 Duratec ... I keep thinking that if I was having voltage issues why does it idle well and high idle well ... - Read more

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