the inlet manifold could Be leaking so check the gaskets or the injector seals
why does my C5 corvette idle poorly ,just for a few seconds when coming to a stop?
Your car may stall or stop running after idle because of a problem with its fuel or electrical system.
If the check engine light does not come on when your truck dies it's probably the idle air control valve
CHECK COIL PACKS
sounds like a sticking idle air control motor they get a build up of carbon after a while.
If there is an erratic idle then the idle air control valve can be malfunctioning. First perform an engine diagnostic to see if there are any malfunctioning sensors. The ECU will the be able to determine if the idle air control valve is broken.
im guessing a bad idle valve
It can cause a rough idle. And it will also cause the engine to die when coming to a stop at times.
air leak
air leak
I have the same problem with my 03. I havent figured out the check engine light but take it to a dealer and they will fix the idle problem. they know about it and if you take it to them they'll fix it for free. it has something to do with the computer needing to be cleaned out.
Most likely your throttle plate is dirty and needs to be cleaned That is the first step The next step would be to check your Idle Air Control motor. The third step would be to check your coolant temp sensor as this can cause to rich or lean a condition and mess up your idle