drove fine for 10 hrs on monday thru rain, then thing decides not to start up last night. motor cranks, fuel delivery seems to be fine (nice smell of gas when trying to start up)..

- pulled the codes today: 0303 (front h20s), 1003 (Park/neutral position sensor)
- swapped spark plugs, doesnt solve the problem..
- checked fuses, none blown

*EDIT*
problem solved. changed the dist. cap & rotor and it fired right up. sucks how some nissan dealers don't stock these even *** they r reg. maintenanace items, had to wait for the shipment from courtesy..

If this is a B13 check to make sure your rotor is still connected to the distributor, there is a small screw that attaches the rotor. I had mine come off before, and had similar problems to what you are saying. Next thing to check is that you are getting spark down the wire, try connecting a timing light to each plug wire and cranking the car, does the timing light flash? The other trick the good spark through a screw driver, but this sometimes can be shocking...