have a 93 honda civic intermitintly will not start and is getting fuel and spark

a lot of the hondas have a problem with key switch and also if it is a auto, trans, ck, the shifter knob if it is not locking in park and the knob plunger that releases shifter is getting old may need to replaced,

IF it IS getting both fuel (delivered , not just pressure in system) AND spark , then intermittently your air is 'incorrect'. Timing belt will not likely cause an intermittent problem. FLOODING , will however , cause starting issues. Pull and INSPECT plugs. KEEP in order of cylinder taken out of. Any wet with gas or oil? Black soot(dry) light brown/ash colored?