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Is the check engine light on?
Does it seem to make any difference if the engine is hot or cold or doesn't it matter?
Like even at the first start of the day you have this problem?
Have a couple ideas for you to try. If the truck has California emissions on it, it should have a mass air flow sensor bolted to the air filter box. Try unplugging it then see if the truck runs any better. If it does, then it's likely the problem.
If you don't have a maf sensor or if it doesn't change the way it's running, then I suspect you have a plugged up catalytic converter. Try removing the O2 sensor before the converter. Take it right out and take it for a test drive. It will be loud, but if the converter is blocked, this gives the exhaust a place to go and the truck should have more power. Both of these should give you a noticable difference right off the bat.
Give it a try and let me know.
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