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It's idling about 300 rpms low

894 views 3 replies 3 participants last post by  95YJgirl 
#1 ·
I recently bought my Jeep from an old man close to my house. He said that he had never replaced the MAP sensor or any of the vacuum lines. I can't say that I've done much to fix the problem but I have replaced the vacuum line leading to the MAP sensor. The dash isn't showing a "check engine" light but honestly I have no idea what the problem is. Help?
 
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