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i have a 96 with the 5.7 vortec. it seems every now & again if i get on it the truck runs rough, like it's not firing on all cylinders, once i let off the gas. if i get on it again it runs fine but at slow speeds & idle it runs rough & almost dies. if i turn the truck off for a few minutes it starts back up just fine.

any ideas what might be going on here? i thought maybe i was sucking up trash into the filter so i changed the fuel filter i few weeks ago. today i did the vette servo swap & after i got on it, it started running rough again.
 
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