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Re: 04 explorer running bad
If this is a coil pack ignition system (no spark plug wires, just a coil pack on each plug), this sounds like you may have a coil pack that is going bad. Do you have a check engine light on? You might also think about having someone take a look at your fuel injectors, if one or more isn't firing this will cause a miss that will sometimes seem like a faulty spark plug. Hope this helps.
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In park, this could be normal. ECU does this. around 2800 to 3500 RPMs. If driving, have the codes read. No codes , could be a clogged fuel filter, bad fuel pump(have the pressure checked), or clogged catalytic converter/s. With no codes, something is restricted..
take it to a mechanic to check the timing. if the timing is off then it may run at a idle an a little above but once you rev it up then the timing will truely show an it will run like ****. have you checked your air filter that may be another cause. hope this helps