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Have you confirmed firing order and location that they are 100% correct now and not 2 crossed?
If you have not already done so my suggestion is to replace the spark plugs
again gaping to spec as there could be a chance of one being bad (even brand new plugs esp if one were dropped).
Since it got worse after the work you did it's best to double and triple check your work including removing the distributor cap, inspect it and the rotor as they could be damaged.
Confirm fuel pressure around 12-14psi area. (Depending on engine)
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