87 silverado dies when come to a stop, sitting in drive

[chadgentry]

I have replaced vacuum lines, egr valve, o2 sensor, fuel filter, plugs, wires, and distributor. Drives and idles in park just fine. When coming to a stop or when putting into gear, basically when foot is not on gas, it dies. Always starts back with no problems, and doesn't seem to die until after I've driven awhile. Original 350 engine, all stock, 90k miles. Any suggestions?

 

[zora]

have you checked for a vacuum leak by spraying carb cleaner fluid around throttle body base?

 

[chadgentry]

Just tried that. No leaks. I just changed the iac valve and its still dying. Was going to try a map sensor next.

 

[Chuzz]

Have you run the computer codes on it? If not, you should do that first. Shot gunning parts at it hoping you find a cure can cost you a lot of money. Check your codes and see what you come up with.