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I have a 99 gmc sierra with a 4.8. About a month a ago my truck started to act up pretty bad. It started misfiring to the point where it shut down and the cats melted. I replaced the cats all 4 o2 sensors and did a full tune up. it did good up until now. the same problem and signs from before are coming back. I really need help on this one.:confused:
 

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On the fuel rail on the drivers side of engine there is a fuel pressure reg.Start up truck then pull off vacume line at reg. See if raw fuel is getting sucked up through line.I've seen this before, kills the cats.
Mike.
 
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