Are you using GM replacement parts? I put an aftermarket rotor and cap on my 93 blazer 4.3 vortec and it did the same thing ......spark at coil but no spark at plug...... Put old dist. back on and the truck started. Got a GM cap and rotor and truck runs great now. GOOD LUCK!
That is indeed odd. I would suspect problems with the hi tension cables if this was not part of the ones you changed since the flow of current ends at the distributor. Check also other cables such as the ground. It is puzzling that all plugs would not have any spark. I would also recommend a scanner used to check for error codes given out by the car's ECU.
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