I've sold used Mutangs in the past with great luck, normally 1 looker 1 buyer, but the one that I have for sale now either

A: Ppl don't show up
B: Ppl who are "intrested" don't call or email back

So should I call them if they don't call me after I email them my number, does it make me look desperate? Supposed to have a guy come by today with a P220 and cash, now that's a guy that I want to deal with but unfortuntalty he hasn't called to set up an appt yet.