1989 Tracer won't start

[mudtucker]

Here's the deal:

• Turns over but won't start.
• New plugs, plug wires, distributor cap and rotor.
• Getting spark at the distributor main wire, end of the plug wire, and at the plug. The spark is possibly a little weak (?) but it's there.
• The plugs have gas on them. Not igniting at the right time? Spark not strong enough?
• The test for the positive side of the coil had passed initially, but now it's failing... According to the Tracer manual's troubleshooting chart, this points to an ignition issue. But if that's true, why was it passing before? Blah...
• If the key was in the ignition, and the door was open, the ignition buzzer used to stay on constantly. Now it stays on for 5 seconds and stops. For whatever that's worth.
  
• The timing belt is intact. Can't speak for the timing.
  
• The main fuse is good.
• I did a basic visual check for shorts. Didn't see anything.
  

Coils and distributors for this car aren't cheap, so I'd rather not replace anything else without a firm diagnosis.

I've reached the limit of my knowledge. Any help from the experts is greatly appreciated.