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Mercury
Mountaineer
Engine
Symptoms
Idle Rough
Rough idle, runs rough and no power
1998 MERCURY MOUNTAINEER
180,000 MILES • 5.0L • V8 • 4WD
AARON DEAN
MEMBER
1 POST
Has a rough idle when I give it gas it bogs out. when I give it gas has little to no power more noise than power sounds bad runs badly.
May 22, 2020 at 1:41 PM
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KASEKENNY
✓
Experienced Mechanic
18,907 POSTS
This sounds like a fuel issue. Let's start with checking the fuel pressure. Here is a guide that will help with that:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Another possible cause is a vacuum leak so here is a video that will show how to check for this:
https://youtu.be/4ktw1X4W_-k
Lastly we need to check injector operation if the previous two items check out.
https://www.2carpros.com/articles/how-to-test-a-fuel-injector
https://www.2carpros.com/articles/symptoms-of-low-engine-power
Let us know what you find and we can go from there. Thanks
May 23, 2020 at 1:05 AM
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