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Any CEL?

What year, how many miles?
 

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I'm no mechanic!

As far as I know, that valve just opens when the truck is running to allow fuel vapor back into the intake. Don't think it would affect fuel pressure.

Are you getting a CEL?
 

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Could be your ECM relay going bad.
 

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Have you tried any fuel treatment? You may have some water in your gas.
 

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Possible causes: Wet or Dirty Air Filter, Fouled or Worn Spark Plugs, Broken Spark Plug, Failed Cats, Failed Fuel Pump, these are just a few things. Don't worry, just get it properly checked to find out what has happened.

What maintenance have you had done?
 

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this sounds like some of the symptoms guys have referred to with the failed cats. Read some of the million threads here about it :bangit:
 

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sounds like the cats clogged for one
spark plugs next since these need replacing around 100k
 

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Cats and plugs would be my guess. Actually sounds like coil packs going bad, but I don't think our trucks have them, which makes me think plugs more than anything. fuel pump would be something to check out as well.
 
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