is stray cat sick

is stray cat sick

I just moved in to a new place a month ago and this stray cat just kept coming around. It's the smallest of the 4 strays in the neighborhood as well as the most scrawniest. I've been feeding it some cat food from the store and it looks better than it did before. But when it meows, it sounds like he has phlegm in his throat. He doesn't even jump like a normal healthy cat. Should I just take him to the pound? I don't have money for the vet. What could be his (or her) problem?