I think you need to start with the basics as there could be numerous reasons to this. Start by checking fuel pressure,engine cylinder compession and make sure that each spark plug is sparking.You did not mention which engine is you have.
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When my Grand Cherokee was having similar rough idling problems, I replaced all the plugs and replaced all the ignition and spark plug wires. I also put in half bottle of fuel injector cleaner in gas tank (full, as recommended). I had both immediate improvement in power, smoother idling and my gas mileage went up 2mpg (approx).