Slant 6 wont idle after warm

DM7969 said
I had thought a possible fuel problem. But it seems strange the idle difficulty is only when it is warm.

Not strange at all.

When the problem originally started I removed the air filter and the car idled better.

This suggests the curb (hot) idle mixture is too rich.

You will want to get the three books described in this thread as quickly as you can, otherwise you'll be shooting in the dark every time something doesn't work right on your car.