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Misfire, what to do now???

My 92 Uk TT has had a misfire for a couple of weeks now, it is only occuring in 4th gear when its coming up to full boost, the engine hesitates and the car looses power...

 

I have ran a diagnostic and found it needed two oxygen sensors which i have now replaced, i have changed the spark plugs too and i am still getting a missfire in 4th...

 

What should i try next?

 

cheers guys

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    Mine started like that.Tried to kid myself it wasnt doing it, as it went so well in first three..........now i've got a 'dead' injector.

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    I have had it at an auto electricians, its powered up at coils+ injectors+ getting a strong signal from ecu at both.

    Cause? fooktifino.

    Bit cheesed off at mo.

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