When the a4 1.8t is cold runs fine. When it gets warm it starts acting funny, the rpm guage flictuates every few seconds like it gets power real quick. Gets jerky to. Its every 3 seconds. Its got paddle shifters. Anybody know the dealio? Tranny flish? It has 110,000 miles. I got a po420 code said catalyst below threshold bankone. I deleted it and its not back on. Anybody?