What car ?
This setting rich bit is crap, don't need to be, if mix is way too rich, this will prevent it from starting, as mix won't be combustable.
More details on the car needed, if you are sure you want to do it yourself.
Hopefully something easy but, confused folowers popping out ?, if car was gutless could be valve timing out, but it should cough and fart a little occasionally ?
tabetha