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    Rough running or vibration?

    I have a 92 4 cyl Wrangler. I have had a check engine light right after 80,000 miles, about 3,000 miles ago. Last week I notice a roughness at speeds below 2000 rpm. I have good power and it smoothes out above 2000 rpm. Notice a smell when I get out of the car. I have changed plugs, plug wires...
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