Runs rough when engine is warm

I reread the posts. Without being able to look at the vehicle, I'm lost. Maybe somebody else has an idea?

JDL; thanks for your help, so now ive replaced the injeckters, intake manifold and still have the same problem with #1 and #3 misfire so off too chevy garage. the only thing it could be is the pcm or defective mass air flow sensor that i got new but who know's ! these are all gm part's

Let us know what you find.

JDL Well chevy garage called me today and it's the PCM which I guess would be all the different codes that I got and why it it ran poorly! it's to bad that there's no-way to check the pcm unless you have the tools to do it! Well I'm $2000 into it now so will have to beat the snot out of her when I get her back! only kidding :) thanks for all your help- Bob

Well, Im glad you got going your way. Hope it is fixed.

I now call it my welfare truck 95475468987!!!! AND DOES NOT WORK! GET IT?

Yeah man, I get it. lol

JDL I was a little premature with the answer or should i say the chevy garage! They called me back today and that was not problem! so they called th gm teck line and they told them disconnect convertor on bank 1 to see if the cat was plugged. The tec there who i know was so puzzled at this truck he was ready to burn it to the ground!!! Being a person who would not give up on a problem looked futher.Well guess what he found? #4 cylinder had a broken exhaust valve spring which was cause'ing a lean code to pcm, mass-air flow! there for adjusting pcm and every thing else, so there was not misfire in #1 and #3 there were firing all along. A simple thing of pulling of a valve cover was all it took to find the problem in which other tecs would have blowen off. who would of thought that an opposite bank would cause this problem hey? Well I would like to thank you for all your help with my problem and hope you a long time in helping other people with there car-truck problems that's why god put you here to help! Thanks BOB

P.S if you don't hear from me it's fixed! lol