Hard start when hot

['87 Static Slam]

oh yeah, i got one other thing that KILLS ME!!

when my truck is hot and i try to start it, it lags REALLY bad trying to turn over. almost like my battery is dead. just a really slow woomp, wooomp, woooomp. and then if im lucky it will turn over. it only does this when its hot. i have actually had to sit at the gas station for 15 mins until it cools off to be able to start it again. when its cold it turns over real qwik with no problems. but hot, after running around town, im lucky to get it to turn over.

any thoughts and or replies would be greatly appreciated!