I have a 1998 EX . She can sit for a week in the cold and she fires up in half a turn. When she is warm however, if I shut her off and go I to a store, come out 5 minutes later, she will crank and not fire. I will have to wait 15 to 20 minutes and she will fire up. I have replaced the coil and the fuel filter to no avail. I guess the next step is see if there is spark unless anyone knows this problem.