ok here it is, my 87 5spd 300z wont start... it truns over but wont crank... ive put new battery on, checked fuel system, got a full tank of gas, checked all but injectors... i unhooked my air filter right at the throttle body, ive checked my plugs, wires, distributor and coil... when i bought the car my brother riped out the horn for the alarm system. but makes no sence ive been driving it for 5 months never had this prob... what happened was i was at the store. my wife went in and it was taking her a while so i turned it off. she came out and i went to start and she just truned over and over... ive checked most of my fuses in the car but not under the hood. any thing that yall can do to help me figure this out would be greatly apricated.