Rough idle, runs rough and no power

1998 MERCURY MOUNTAINEER
180,000 MILES • 5.0L • V8 • 4WD
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AARON DEAN
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  • 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 8:41 PM
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KASEKENNY
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  • 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 8:05 AM