Idle Air Control Valve

Remove and clean the EGR valve. If problem persits, let me know and we will go from there.

Possible intake manifold gasket (vacuum leak).

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.

You're probably looking at it backwards. "A" and "B" are the only two terminals next to each other in one corner of the plug. There's one of those two pins missing in all the other three corners.

If the idle speed motor is working normally, you shouldn't have to do anything. The same part is used on Chrysler engines, and in the rare event one fails, you just pop a new one in and you're done. The Engine Computer controls it as necessary.

You can simply disconnect the battery if you want to clear the adaptive memory but that really isn't necessary when replacing the IAC.

[quote]All general motors vehicles automatically re learn idle every time a variable is changed [/quote]

Correct, The only thing changed with resetting memory is the starting point.

The IACV could be going thru its relearning process

You can find someone that owns a Tech1 or compatable and have him reset it or keep driving it till it resets itself. About your exhaust system problem you're pulluting the air, you might end up getting a ticket for excessive unwanted noises-get it fix as soon as possible.

First clean the throttleplate on both sides as well as iac hole. Or remove the iac and shoot choke cleaner in it then start the car. Then drive it at least 35 mph to reset the iac and see how it goes. While under the hood look for any vacuum lines disconnected.