HI can anyone help ?? my a3 is spluttering/ misfiring ?? between 2 & 3 thou revs, when you put your foot down its like it loses a bit of power then regains it constantly like a juddering effect ?? was fine the other day then put sum deisal in and jus started doin this dont no if sum crap in fuel but cant see it been this as it dont do it in first gear or when just revin it seems fine then, did fit a new ect sensor the other day but this shudnt effect it shud it 
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