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Have you had the catyltic converter checked? Sounds like it might be blocked. Get a vacuum gage and conect it to a good vacuum source and hold the idle speed at about 2500 rpms and watch the gage ,if it drops slowly the converter is blocked. You might also want to check your transmission oil. If it isn't circulating properly you might be burning the bands on your transmission with the resistance of going up hill.

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โˆ™ 2006-01-08 16:00:58
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Q: Why would a 1991 Chevy Lumina 3.1L only go 10-15 mph uphill on the highway even after the fuel filter and spark plugs and spark plug wires have been changed?
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