haha, yeah we had our thanksgiving over a month ago.... but no it happens when the car is warm as well, I figured it was only doing this after filling up, but that is not the case as it happened last night and again this morning. When it rumbles and shakes it almost feels like it has a Hemi or a big block in it.... sounds cool but can't imagine it being good.... I figure faulty O2 sensor I think, or a bad injector?? we'll have to see