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Old Feb 2, 2011 | 03:26 PM
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gas burner

Hey Guys I brought my 92 5.0 f150 in to the shop because it would not start, after replacing the computer, engine temp sensor, fuel pressure regulator.It now idles rough and mpg went from 15 mpg to 9mpg anyone have any ideas, this shop is not able to figure it out. Im out of money and will have to fix it myself Please help
 
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Old Feb 2, 2011 | 03:29 PM
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Any codes stored in the computer?
 
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Old Feb 2, 2011 | 03:36 PM
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gas burner

They checked the computer after I drove it about 80 miles and it came up clear it was showing the ox sensor closed so I replaced that also
 
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Old Feb 2, 2011 | 03:40 PM
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With no codes, it makes it a little tougher to diagnose, but not impossible.

Some things that come to mind:

Vacuum leak, EGR stuck open (though this should set a code), bad ignition parts (plugs, wires, ignition module).

Was the truck running like this before you had the shop work on it? In other words, was it running like crap, then died, then you took it in to the shop?
 
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Old Feb 2, 2011 | 03:45 PM
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gas burner

No the truck ran fine, came out one morning and would not keep running I had to keep the gas on to keep it running, when I let off the gas it would die
 
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Old Feb 2, 2011 | 04:03 PM
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Well then, add one more idea to the list: The IAC, or idle air control. Some refer to it as an IAB also.

At this point, I'd suggest to check for codes again, just in case there are some. Here's a link to how you can check them: Ford Fuel Injection » How To Run a Self-Test

And here is a link to the code meanings. I'm pretty sure your 92 should have 3-digit codes: Ford Fuel Injection » 3 Digit Self-test Codes 111-171
 
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Old Feb 2, 2011 | 04:16 PM
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Thanks for your help, Im going to bring it back to the shop so they can check it out I payed them alot of money to fix this problem so now I will be a pain in the a** till they fix it. thanks again
 
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