Have you had or seen this issue before? Easy fix?
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On my old car (not Jeep); exactly what you described happened.
I was under the hood with the engine running (for reasons I can’t remember) and I noticed a “FFFsssssshhhhh” kind of sound. I didn’t think too much of it at the time, but when I check engine light came on, I knew something wasn’t right.
Check engine fault codes were “Air / fuel ratio too lean” and “random misfires” (I don’t remember exactly the code numbers, but that’s what they meant)
I inspected all the visible vacuum hoses, but didn’t see any cracks or anything that would suggest a leak.
Then with the help of my dad we managed to trace the “ffffsssshhhh” sound to the back middle of the engine. Then I tried to spray starting fluid around the manifold and sure enough the engine reved up.
After removing the intake manifold, I noticed a small vacuum hose that was not visible with the intake manifold on. And it was not only rock hard but it also had visible cracks all over it.
After changing that hose and the intake manifold gasket, and cleared the fault codes, the issue was resolved.
Was an easy fix? ....well at the time I didn’t really know what I was doing and my local mechanic plus people online (not this forum) kept saying it was fuel related and I had a clogged fuel filter. All of which was not even remotely true.
I spend a lot of time diagnosing and researching the issue myself, so thinking back on it now; if I had known what to look for it would have been a lot easier, but at the time I didn’t have the slightest clue about where to start or what the issue could be.
But this was the issue and fix on my old car. It doesn’t mean it will be exactly the same fix or issue on your car.
So back to your issue: I mean from what you have described; my educated guess (keyword: guess) is that you have a vacuum leak somewhere. But again it’s just a guess.
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