Hey Guys, 
My 280z was perfect, started up fine, ran great, only 83k original miles. 
  
Anyways, today, I cleaned up inside the engine a bit, using a towel and some orange type cleaner spray.  
  
So I started it up, and it started up and hesitates (the charge light blinks and it feels like it was going to die), rev'd it, and it hesitates after I let go of the throttle. 
  
After a couple of times it died and starting up, it doesn't start up anymore.  It was night time, but I think I saw some sparks coming from the spark plug wires in one area, although it physically looked fine.    
  
What could be the cause?  Did I knock something loose?