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Engine misfire

(1999 Chevrolet Tahoe)
in San Marcos, CA on February 08, 2010
Cylinder #5 misfires only at idle. Checked compression, came out low compared to other cylinders. Squirt oil into cylinder, recheck compression, compression comes up. Rings? Can’t pass smog. mileage = 205k
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Popular Answer
Unfortunately it does sounds likely to be a ring problem. A cylinder leakage test may show more information.
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