Symptoms of bad head gasket

[Billy Mild]

My car has been running pretty good minus a slight hesitation with opening the secondaries when not fully warmed up. Once fully warmed up they seem to open up normally after I have gone WOT a few times. Its like they are almost sticking, but I heard lazy O2's can cause this. Will be replacing after my header swap.

Now to the serious issue. Lately if I drive my car for say 30 minute or more then go to shut off the engine and re start it a few minutes later it runs really rough. Almost as if one of the cylinders is misfiring/not firing at all. If I rev it up a bit, and start to drive the engine seems to run fine within a few seconds.

I remember my old 96 Neon when its headgasket went out behaved similarly except when it would run rough, it would continue to run rough until it completely cooled off. The ZR-1 isn't exactly doing that.

What are some of the symptoms of a bad head gasket?