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well it sounds like you have some backfiring going on. do u have any valve chatter too ? i know my car does that too and it goes away after a vlave adjustament.
as for the sparkplug wires it's really hard to tell if you don't know the specifics of the wires, but the spark plug gap does not need to change only if you do the spark plug wires. it will change when you get like an aftermarket ignition
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