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The first thing a mechanic would check is for power and a ground signal for the coil. The pickup coil in the distributor sends a signal to ground the coil. The coil sends the spark to the distributor cap thru the rotor to the plug wires.
Was the timing chain damaged ? Did you have spark from the coil before you replaced the other parts ? Do you have battery voltage on the positive side of the coil with the key on and in crank mode ? Is the coil wire not sparking, or are you not getting spark at the plugs ? Is the distributor rotor turning when you crank the engine ?
I had the same problem with my 2000 GMC Safari two years ago....drove me CRAZY!
Sometimes it would start right up...other times it just would crank and not start.
It turned out to be a cracked coil....I found it by using a spray bottle with water in it, and "misting" the engine, at night....with the engine running. (On a night when it DID start!)
It took a while, but finally the hairline crack let in some water and the electrical short showed by a spark coming out of the coil.
I replaced the coil with a new one, and it has never "not started" since.
Evidently the coil cover gets brittle and develops small, hairline cracks due to heat from the engine.
Oh...by the way....I tested the coil it showed that it was fine!....but it took the "misting" at night...in the dark...to find the spark "leaking" out.
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