What kind of carb and choke? exh. heated choke tube or electric choke or manual choke?
A pic with the air cleaner off would help a lot. Your choke may not be opening fully when warm.
Could also be that your timing is off, do you have a timing light?
'67 Coupe 289 stroked to 333, AOD, 9" w/3.50:1, PDB, Candyapple red w/red deluxe int., PS, ext. decor group, light group, foxbody seats.
'09 Black Warriors In Pink with glass roof - the wifes Mustang.
"If it ain't broke, I haven't fixed it yet" -Jon
My 70 did the same thing and I thought it was the carb. I had the old mallory duel point system on there and that was the problem. I put the new MSD electronic ignition system and MAN what a differance. No more stalling out after she warmed up. If you don't want to change everything check your coil.Sometimes when they heat up they don't send a good spark to the distributor. Check your spark at one of the ends of your cap by letting it arc. My spark got so weak I didn't even know how the car was running.