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wont go over 25mph then dies


Old 03-14-2018, 02:14 PM
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Default wont go over 25mph then dies

1996 f250 5.8 standard transmission. it seems to run fine in reverse but in forward it will run to about 25 then bogs down so much that it dies. i have changed the fuel filter, egr, idle air control valve. any ideas what else i need to change to fix this problem?
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Old 03-14-2018, 03:05 PM
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Is it 25 mph or a certain RPM? You can probably do 25 in 1st, 2nd, or 3rd easily. Might actually be an engine speed or airflow problem, not a speed problem.

Does it hit "25" then bog and die immediately? Or can you drop down to "20" and keep it going?

Why did you change those parts and did any of the changes have any effect? Have you changed the air filter and/or cleaned the MAF?
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Old 03-14-2018, 10:38 PM
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Check the fuel pressure - with a gauge.
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Old 03-15-2018, 05:10 AM
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Additionally, I would check for a plugged Cat converter. You can verify with a vacuum gauge.
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Old 03-15-2018, 11:09 AM
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We need to see all the truck's details (of which "standard" is not one) & history in your signature:

(phone app link)
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