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Hello all,

89 6 cyl Jeep Wrangler YJ - went out and started up the jeep this morning and noticed it sounded different. The idle was really rough and the during driving it sounds like its sputtering. Opened up hood during idle sounds like its running through a cave or something - checked lines seemed ok, exhaust looked OK, maybe a stuck valve? Any thoughts on this?
 

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A stuck valve would cause a miss or a backfire. You could start by doing a compression check warm and looking at your plugs they will tell you the story if you read them. Then press with the troubleshooting. Here is the plug chart.
 

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