Hi i got an ford fairlane 500 -57 with an 312 engine that runs great when driving but i have a problem, when the engine gets warm and im standing still with the engine at idle speed it stalls after maybe 5-10 minutes. when its about to stall i can rev the engine but as soon as i get of the throttle it will die, but if i put it in D and drives for maybe 1 min the idle will work again for another 5-10minutes.If the engine dies it not funny to get started again. i can add that when im driving my engine temp is normal but when im standing still it will go up to maybe 200 degrees F. I have tried several things to solve this and dont realy know what to do. I have change sparkplugs and cables, ignition coil, and installed a pertronix ignitor gen 1 and set the ignition timing to 6°. i have changed all gaskets in my edelbrock 600 and adjusted float level. changed fuel filter, adjusted valve lash. i have also mounted a thick "plate" between carb and intake. nothing has helped. anyone got a clue on what to do next ? and one more thing, if i set idle speed to 600rpm it can be 500rpm a few stops later and can also be 7-800rpm maybe its normal ? and sorry for my bad english im form sweden.

Best regards Joel