2000 silverado w/6.0L , after driving vehicle and it is well warmed up and once i turn off my truck and let it sit for about 20-30 minutes, it does not want to run . it idles fine but when trying to accelerate it pops and backfires through the intake. runs very rough for quite awhile then finally clears up and runs fine. have changed coil and plugs. read out stated #2 cylinder misfire.

SOURCE: 1995 Chevy silverado with a

I have experienced this problem on similar vehicles. You should try and replace the coolant temp sensor. If it is not reading the correct temp to the ecm, it will not get the right fuel map. Also, the cts will not always throw a code.

SOURCE: when cold, it idles rough, revs high then low! After warmed up it runs fine

if it runs high when you first start it then mellows out,, theirs no problem , all of our chevys do that.... but if its sputtering or you hear a quiet popping noise check spark plugs

SOURCE: 2001 Chevy Cavalier Misfire

Have you made sure your getting spark on every cylinder from the coil pack?

SOURCE: 1997 chevy truck running rough

97 chevy 1500 4x4 replaces plugs wires cap rotor dist pick up and crank sensor truck run good when cold as soon it heats up and comes to stop it feels like it boggs down runs rough and stalls any idea what to do?

SOURCE: 87 chevy 350 fuel injected pickup wont run smoothly

sounds like your egr valve is gummed up or bad. this is located behind the throttle body and has a single vaccum tube connected to it. if the diafram is still good you can remove it and clean it with WD 40 until the plunger works smooth