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Some emissions problems are cumulative. Use a code scanner to read any stored computer codes. If you take care of any existing problem codes, the vehicle will probably run a lot better. try new intake manifold gasket, new bolts, servicable loctite . my yj was doing this the computer didnt have any codes but gas mileage was down and stalled in damp cold with warm engine the new gasket did the fix, the bolts stretch so i would get new ones. one would think ignition but that wasnt it ,spark plugs would get very wet

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โˆ™ 2009-04-19 22:13:47
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Q: What is wrong when a 1989 4 L straight six runs great until it warms up and then it hardly idles and only the emission light is on but has been on for months?
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