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Unread 11-29-2012, 06:14 PM   #61
Rico25
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2004 TJ Wrangler 
 
Join Date: Aug 2011
Location: Mississauga, Ontario
Posts: 48
So the ignition coil was the culprit? Would that cause the plugs to go black? Like as if the were getting a fuel rich mixture? Hopefully this will solve the problem.

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Unread 11-29-2012, 06:49 PM   #62
Knuckelhead
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2000 TJ Wrangler 
 
Join Date: Aug 2005
Location: Colorado
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Quote:
Originally Posted by Rico25 View Post
So the ignition coil was the culprit? Would that cause the plugs to go black? Like as if the were getting a fuel rich mixture? Hopefully this will solve the problem.
Weak spark?...
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Unread 11-29-2012, 07:04 PM   #63
Rico25
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2004 TJ Wrangler 
 
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Location: Mississauga, Ontario
Posts: 48
Second set of plugs since April
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Unread 01-28-2015, 06:40 PM   #64
manderson2228
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2004 TJ Wrangler 
 
Join Date: Sep 2009
Location: Roswell,GA
Posts: 70
Sorry to bring up old post, but did you ever solve this? I am having the same problem, and have replaced damn near everything at this point.
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Unread 08-17-2015, 08:19 AM   #65
jakeohio726
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1995 YJ Wrangler 
 
Join Date: Apr 2010
Location: Arizona
Posts: 1
Hi everyone,

I have been experiencing this same issue where my Jeep YJ with Automatic transmission would have a rough idle when driving for a period of time especially in outside temps exceeding 100degrees. Ive noticed this once i put my Jeep in park it would idle smoothly and once i put in drive it would bog down and up and down again like it was about to die. My fix was adding an Aftermarket Transmission cooler to my Jeep. Weird as it seems I had my mechanic check everything from the Cap, Rotor, plugs, vacuum, IAC, computer.....I mean everything until I added the transmission cooler and WALLA.......No more bogging down. My temps do not exceed 200Degrees on my radiator. Jeep runs smoothly at stop signs/lights. So i would recommend adding a transmission cooler if you havent done so. Just my $.02 (Cents) worth.
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low rpm , please help , rough idle

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