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Rough cold idle

2K views 1 reply 2 participants last post by  Red J 
#1 ·
I have a 2001 Wrangler Sport 4.0

Lately it seems to have a much rougher idle when first started cold.

Does anyone have an opinion as to what this may be? Simple fuel filter, or is there a cold start valve that goes out occassionally?

Thanks
 
#2 ·
I had the same exact problem. Two years ago Jeep came out with a technical service bulletin (TSB) to fix this. I believe it is only with certain 2001s. I went to the dealership and asked them to look it up. It did the trick.
 
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