Check your timing and inside the distributor for bushing play, leakage, or other visible issues, craked cap, serious wear, trashed rotor, etc. I think they have an ignition module also. If the distributor has been fiddled with you may see a shadow where it was installed from the factory. Might try it back there if that is the case. It may also be a tooth off on the timing belt. Not a bad idea to at least confirm the condition of the timing belt on a new purchase, from someone who had one break 5 miles after I bought it (not a vx-old Sentra).
Welcome aboard
mech
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