It may be a vacuum leak in the vacinity of the idle air control valve. My 300TE would stall out after warming up as you came to a stop/slow turn. I heard a vacuum leak and finally found that the hose between the idle air control valve and the port under the fuel distributor had cracked on each end (after 200,000 miles ... what's the world coming to?). I put some seals all on the inside surface of the hose ends to get by until I can get a proper replacement. Runs fine now.

You might check this first before adjusting or replacing anything else.