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engine missfire at higher speeds

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Old Nov 4, 2011 | 10:51 AM
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Question engine missfire at higher speeds

while driving the truck the motor will lose all power when I give it the go pedal. I had no problems this morning but on my way home it started to do this. When I speed up from a light or stop sign, it feels just as powerful as normal.

It will not die, I just cant give it more than 1/4 throttle. If I take it out of gear it idles great. The truck slows down to about 30 and then regains power. Its an intermittent problem and I am stumped.

88 1/2 4.9 I6 fuel Injected
 
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Old Nov 4, 2011 | 02:42 PM
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Maybe fuel pump
 
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Old Nov 4, 2011 | 03:39 PM
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Would the fuel pump fail and then work and then fail again?
 
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Old Nov 4, 2011 | 04:34 PM
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If the pump is weak (or the filter is clogged) it won't be able to deliver the fuel required at higher speeds or under high load conditions, but will be enough to keep the engine running when it requires less fuel (cruise/idle).
 
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Old Nov 4, 2011 | 05:44 PM
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Ok I bought a new filter on my way home and will change that shortly.

When I moved the truck from the front to the garage, the fuel pump priming sounded like it was full of rocks (it sounded really bad)
 
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Old Nov 4, 2011 | 07:02 PM
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not a good sign.....you might have found the problem
 
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Old Nov 4, 2011 | 07:57 PM
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Ok. new filter installed and now it will not start at all

Off to pick up the inline pump
 
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Old Nov 4, 2011 | 09:14 PM
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Ok. New fuel filter, inline pump, still runs like crap.

front cat gets hot, second not so much, but i didnt drive much (because it runs like ****)

Possible clogged cat??
 
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Old Nov 18, 2011 | 06:44 PM
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OK. New inline fuel pump, in tank fuel pump, and throttle position sensor.

It runs good until its warmed up, then will not run at all.

I am all out of ideas
 
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Old Nov 18, 2011 | 09:53 PM
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It's an 88?

Ask the computer what it says is going on.
 
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