I have a 1991 240sx and recently i redid the timing components and put it all back together but when i went to fire it up it wouldnt start. it cranks over perfectly fine but wont start. i checked and there is no spark coming from the ignition coil what so ever. it ran perfectly fine b4 i got to it... lol and everything is how it should be but it wont start because no spark. anyone know what might be the problem?