My 97 geo metro keeps missing and backfiring. We've changed and cleaned the spark plugs and now it's doing it even worse. Any ideas?

Cars & Vehicles
Geo Metro

Spark plug electrode gap, distributor cap tracking/cracked, rotor tracking, plug wires and plug hoods tracking to engine. Start car in the dark and look for sparking around distributor cap and along the plug wires. Sometimes the plug wires spark to the engine case where they are lying against it and cannot easily be seen. To minimize risk of electric shock use a length of wood to move the wires around.

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