Car Wont start

stator aka distributer pick-up aka hull effect sensor....i had troubles like you are describing to me, for a month or so and my mechanic couldnt figure it out, i had to buy a repair manual for my car and i looked through the schematics and voilla...i found the problem...the way i isolated it, was when i had troubles with it, i would open the dizzy and spray contact cleaner on the sensor, to cool it down and it would fire every time, the next time i turned the key. does it usually happen when it is hot?

well, when it cranks and wont fire, have you checked to see if you are missing fuel or spark?

good luck.