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would bad spark plug(s) lead to other electronic issues ?

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My 1985 Venture Royale with 73,000 k's starting acting sluggish ..Starts up fine and idles fine for a bit then blogs down. Under load it feels sluggish and you can smell unburned gas. At same time the Tach gauge starting working intermitting . Plan on changing plugs as a first step(has new Battery). It was suggested even one bad plug can cause other electronic issues. Is this so?

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About the only other issue a bad plug can cause is static on the radios.


A big clue is the tach acting intermittently. The tach is driven from the primary side of the #2 ignition coil. When the tach goes out it means the #2 cylinder is not firing.

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