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High idle question

237 Views 3 Replies 2 Participants Last post by  commodog
My 99 wrangler 4.0 seems to get a really high idle after it’s warmed up. I assumed vacuum leak but can’t find any using the carb cleaner method. It’s got 95k miles on it so I assume some sensor failed.
Also has a brand new exhaust manifold but it was doing it before I replaced it.

thanks
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99 Jeep Wrangler Sport 4.0 with automatic
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339 Posts
Discussion Starter · #3 ·
Could the coolant temp sensor cause similar issue? I noticed a little fluctuation in it the other day but it’s also 115 outside
 
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