head gaskets installed now runs rich and stalls

[supercamaro]

I just replaced head gaskets on my 97 transport runs good after it warms and at low idle like coming to a stop, it stalls starts right up and runs fine for a minute I pulled into the drive way and let it run at idle for about a minute and it stalled with no codes showing and no lights on smells rich. Did i mis something??

[roadrunner2]

Originally Posted by supercamaro

I just replaced head gaskets on my 97 transport runs good after it warms and at low idle like coming to a stop, it stalls starts right up and runs fine for a minute I pulled into the drive way and let it run at idle for about a minute and it stalled with no codes showing and no lights on smells rich. Did i mis something??

Check that the IAC valve is tight and the electrical connection is good and/or the valve is clean.

If that's good then I would clean the throttle body.

There MAY also be a loose or disconnected vacuum hose.