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You did not specify year so I will assume it is an older one.

If it is spark related then a cracked distributor cap ( so small you may not see it ) or rotor, and dont forget the plug wires, one or more may be bad or grounding against the engine before the plug.

I suggest replacing them all ( cap, rotor, and wires ) then check timing.

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15y ago
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Q: Why would a 350 engine keep missing with all new spark plugs?
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