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Turbo fuel stratified injection (TFSI) denotes a type of forced-aspiration ( turbo ) engine where the fuel is pressure-injected straight into the combustion chamber in such a way as to create a stratified charge.
The ignition coil is basically a Tesla coil that supplies the ignition spark for your spark plugs. Stock runs about 20,000 volts. After market versions are sold that run about 40,000 volts. I would say to check your spark plugs and wires first as I have never seen a coil act like that.