stalls out when idling

i have a 95 buick century that has 126000 miles on it. whenever i turn it on to warm it up in morning, or i just just keep it idling in park; the engine temp runs a hot; but before ithe temp gets out of hand, it usually chokes out (lack of gas and/or air.) [this prob usually occurs when engine is cold, or hasn't been ran for a couple of days.] Any advice?