95 rough idle and stall upon start up

On warm to hot days, Conti will run rough usually stalling, and after a few attemps to keep it running, will run smooth after 30 seconds or so. Only does this once in a while and runs great normally. I first thought the fuel tank may be vapour locked but gas cap wasn't hard to get off. There are no check engine lights or error messages. Just tough to keep it running initially again once in a while and only on hot days ( 85 fahrenheit plus ). P.S Conti's only got 53000 miles and runs like new except for this little issue. Fully serviced by Lincoln to date so it got what it needed when it needed it so far ( flushes, tune ups, change ups etc. )
Any thoughts anyone?
Purp

Could be a dirty or sticking Idle air control valve, Throttle body, or EGR valve. All can be simply cleaned. Good luck.