351w high idle / bogs down when accelerating
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2nd Gear
Joined: Sep 2025
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351w high idle / bogs down when accelerating
I have a 1995 f250 with the 5.8. It has been idling around 2300rpm and has very poor power. If I give it more than 1/3 throttle it bogs down and wants to shut off. It usually has trouble starting up but a little carb clean and it starts up.
It has a check engine light, so I purchased a ford obd1 scanner but couldn’t pull the code.
The vacuum lines seemed to be in bad shape so I went ahead and replaced them all one at a time.
Even after, it is still having the same issues.
I have also done fuel filter, spark plugs/wires, iac, and tps.
I do not know where to go from here.
Any suggestions are appreciated
edit***
when iac is unplugged rpms drop down significantly but idle is rough
It has a check engine light, so I purchased a ford obd1 scanner but couldn’t pull the code.
The vacuum lines seemed to be in bad shape so I went ahead and replaced them all one at a time.
Even after, it is still having the same issues.
I have also done fuel filter, spark plugs/wires, iac, and tps.
I do not know where to go from here.
Any suggestions are appreciated
edit***
when iac is unplugged rpms drop down significantly but idle is rough
Last edited by aj.wetzel; Sep 16, 2025 at 05:26 PM.
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Joined: Jun 2015
Posts: 12,763
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I have a 1995 f250 with the 5.8. It has been idling around 2300rpm and has very poor power. If I give it more than 1/3 throttle it bogs down and wants to shut off. It usually has trouble starting up but a little carb clean and it starts up.
It has a check engine light, so I purchased a ford obd1 scanner but couldn’t pull the code.
The vacuum lines seemed to be in bad shape so I went ahead and replaced them all one at a time.
Even after, it is still having the same issues.
I have also done fuel filter, spark plugs/wires, iac, and tps.
I do not know where to go from here.
Any suggestions are appreciated
It has a check engine light, so I purchased a ford obd1 scanner but couldn’t pull the code.
The vacuum lines seemed to be in bad shape so I went ahead and replaced them all one at a time.
Even after, it is still having the same issues.
I have also done fuel filter, spark plugs/wires, iac, and tps.
I do not know where to go from here.
Any suggestions are appreciated
Thread Starter
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2nd Gear
Joined: Sep 2025
Posts: 2
Likes: 0
It is indeed efi. I bought a little yellow innova ford obd1 reader. Have not tried a different scanner, so it could be a bad scanner I guess.
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Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
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