i have a 93 del sol,d16z6 auto.it runs great,most of the time but every so often it cranks but wont start.battery is good,plugs and wires are new,rotor and cap 6 months old.it has done this for a few years and usually once you crank it 4 or 5 times it starts and runs like everything is fine.this morning i thought i was going to be late for work,cranked it about 20 times and nothing,like its not getting gas,on the last try it fired right up and ran fine.what to check???