I bought my SVT a few weeks ago with 100k miles. Im very pleased with its performance and like everything about the car. The problem is when im riding through town in a 25mph zone the car wants to chug and jerk. It only occurs when I am applying just enough throttle to maintain speed. The second I start to accelerate the chugging stops and the car runs perfectly smooth. The jerking occurs at higher speeds too, but only while maintaining speed. I replaced the plugs, cleaned the throttle body, examined the intake, but nothing is fixing it. To me it feels like a problem in the air or fuel system, but I can't pinpoint it. Any ideas ?