Loses power while driving rough idling

5,000 MILES • 5.2L • V8 • 2WD • AUTOMATIC
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HOWARD01
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  • 1 POST
At 1 St it would run rough and sputter only whenever I would ist start it up on the day but then would start up and run fine the rest if the day. This would happen daily. I bought this truck used and supposedly had a rebuilt engine . Then about six months later all of a sudden it turned over but wouldn't accelerate when gas pedal was pushed instead it would die. It idles. I've replaced many parts since then and nothing has fixed it. Now it will accelerate and but it still dies while driving. Ive changed the battery, starter, ignition coil, spark plugs, various sensors including O2 sensors, fuel pump. Please help. Thank you.
Jun 9, 2021 at 7:24 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,512 POSTS
This happens when the fuel pump is weak. To confirm the issue here is a guide to show you how to check the fuel pressure and I have included instructions on how to change out the fuel pump as well in the diagrams below:

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
Jun 18, 2021 at 5:29 AM
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