1985 Plymouth Reliant NO IDLE

The engine is a 2.6L Mitsubishi engine with 450,000 Km on her. This engine has given me years of great service. The other day I drove to work (around 20km) and as I pulled in to park she died. It restarted right away, but would not idle. I have turned the curb idle way up so that I can drive the car. When she is cold it runs fine and as it warms up the idle gets rougher and rougher. I checked all the vacuum line for cracks and found nothing. I sprayed soap water on everything and found that the intake manifold gasket was leaking. Changed that and it help a bit. I have done a compression test with results of around 150psi on all four cylinders, with no leak down at all. This leaves the carb which seems to be working fine. If I cover half of the carb the engine runs perfect. She is getting too much air but I have no idea from where. I also have removed the egr system and that is all blocked off. Should I pop the head off, don't want to because the head gasket is only one year old.