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Ideas for 91 YJ Rough Idle

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1991 jeep YJ idle rough. New plugs, wires installed. Distributor good. Sounds like a miss at idle. Not much power on highway and bad gas mileage (200 miles per tank). Any ideas? TPS maybe or bad valve? Except for loss of power on hills and bad gas mileage, seems to run along fine except at idle. Idle seems to be getting worse. Any ideas?
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