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If you are getting spark on 4 of the cylinders then I think your ecu, coil, etc should be good. Initially I would think you have a dist cap problem, a crack? But you said you replaced the distributor, I assume it came with a cap?
I cannot remember the years but back then there was a procedure for indexing the distributor. There was a tsb were you cut a hole in the cap and used a multi-meter to verify where it was. If i remember correctly the spark would cross fire inside the cap. I wonder if your distributor has shaft or bushing play and not delivering the spark? This would be more so of a problem with the distributors that were not adjustable. quite a few years they were pinned into place.
if you pull your cap off you should only be able to move your rotor a max of 1/8 inch.
 
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