1992 Nissan Sentra Starting issue

1992 Nissan Sentra 4 cyl Automatic 186000 miles

Hi there, can someone helps please.
I have a nissan sentra 1992, it runs well, except when the day is hot and I turn it off after driving about 1 hour, it doesn't start. BUT. If I start immediatly after turnnig off, it turns on, only if I try after 10 or 15 minutes. It doesn't.I alwasy have to wait almost 40 minutes to 1 hour before it can start. They told me it could be the distributor, I changed it but still no way. And as I said, only when the day is hot like a summer day, it never did it during the winter. Please give an advise