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Old 11-22-2011, 10:15 PM   #1
Join Date: Oct 2011
Posts: 33
possible spark plug idk...

When engine is cold misses like crazy

87 YJ
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Old 11-23-2011, 06:42 AM   #2

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Check your intake and exhaust manifold bolts for tightness. Happened with me last week


1989 Wrangler "Islander" 4.2 6cyl 5 speed

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Old 11-23-2011, 10:33 AM   #3
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could be moisture in the cylinders from sitting overnight fowling a plug until it dries out enough to fire the gas. Pending nothing else is wrong...

...always start with plugs. They are designed to fail after an avg. of 20-30,000 miles or so. Some say 50,000 or 100,000 miles but still, they're spark plugs. They take more regular abuse than many other things. Even 1 gas station with crappy gas can ruin the plugs and it really takes a hit on the smoothness of the idle and also acceleration.
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1994 Wrangler YJ I6 4.0 H/O Auto 3 spd. 4" RC (33x12.5) (15x8) 3:54 Gears
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