Will not go over 40 MPH

1998 DODGE TRUCK
220,000 MILES • 5.9L • 2WD • AUTOMATIC
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KRISTINAC8723
  • MEMBER
  • 1 POST
I have a Dodge Ram and last week it was very sluggish. it still moves it takes a very long time to get up to like 45 MPH at the most. it shifts if you are in park and give it gas it gets to 3 RPM's and then almost cuts out or idles down a little. could this be a fuel filter problem possibly?
Dec 4, 2020 at 7:45 AM
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DANNY L
  • Experienced Mechanic
  • 5,648 POSTS
Hello, I'm Danny.

The first thing that needs to be done is to check to see if there are any codes from the check engine light to determine what is causing the problem with your car. Here is a tutorial what is involved for checking diagnostic codes:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If you don't have access to a code reader or scanner auto parts stores have tool loaner programs and can rent you one. Auto parts stores like AutoZone can check codes for free. As far as a plugged fuel filter that is a possibility. I would as perform a fuel pressure test to see if your truck might have a failing or weak pump that isn't providing enough fuel pressure. Auto parts stores can also rent you a fuel pressure tester. Here is a tutorial showing a fuel pressure test:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

The correct fuel pressure for your truck is 49-54 psi at idle.

Once you perform these tests get back to us with the information and we can then properly diagnose what the issue is with going on with your truck. Hope this helps and thanks for using 2CarPros.
Dec 4, 2020 at 10:43 AM
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