351w 5.8 bucking - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 11-17-14, 07:10 PM Thread Starter
Registered User
 
Join Date: Nov 2014
Posts: 4
351w 5.8 bucking

hey guys I'm new here and I have a 1990 F250 351w 5.8 EFI, I have problem up hills and at cruising speed. the trucks bucks and kicks like its stalling and the rpms jump way down for a quick second and come right back up. I've looked at forums and nobody seems to have an answer for this problem, any suggestions would be greatly appreciated, thanks

ishkabible is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 11-18-14, 03:59 PM
Dazed and Confused
 
CatSkinner's Avatar
 
Join Date: May 2012
Location: Upstate New York
Posts: 7,571
Re: 351w 5.8 bucking

Normally I'd ask about the cats, but plugged cats normally don't jump back like that. Any codes? I'd also be looking for fuel pressure, might be worth while getting a gauge that you can read while driving. In the meantime, I'd check the fuel pressure regulator. When was the filter last changed?

Fuel pressure regulator ford truck

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
CatSkinner is offline  
post #3 of 7 (permalink) Old 11-19-14, 05:03 AM Thread Starter
Registered User
 
Join Date: Nov 2014
Posts: 4
No codes are being shown and I changed the filter like a week ago. I will need to see the fuel pressure I was told it was the spark cutting out but I can't find any problems there and I have a brand new MSD ignition system
ishkabible is offline  
Sponsored Links
Advertisement
 
post #4 of 7 (permalink) Old 11-19-14, 06:58 PM
Dazed and Confused
 
CatSkinner's Avatar
 
Join Date: May 2012
Location: Upstate New York
Posts: 7,571
Re: 351w 5.8 bucking

What type of plugs are you running and how old are they?

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
CatSkinner is offline  
post #5 of 7 (permalink) Old 11-20-14, 03:40 AM Thread Starter
Registered User
 
Join Date: Nov 2014
Posts: 4
They are auto lite racing plugs and they relatively new the truck sat for a while with the plugs in there but I've never been told that could hurt anything.
ishkabible is offline  
post #6 of 7 (permalink) Old 11-20-14, 12:03 PM
Moderator
 
Join Date: Nov 2008
Posts: 1,188
Re: 351w 5.8 bucking

Unless you are running your 351 in quarter mile drags or oval flat track you don't use racing plugs. They are a " cold " plug and don't get hot enough in street use to
burn off any fouling. Put in the proper plugs for starters. And don't use Autolite.
chipset is offline  
post #7 of 7 (permalink) Old 11-20-14, 02:20 PM Thread Starter
Registered User
 
Join Date: Nov 2014
Posts: 4
I just bought the truck and the previous owner put them in and they looked clean but I had no idea racing plugs would affect it that much...I will try changing them
ishkabible is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Windsor Tech


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome