ok last night when i was on my way home, i was being stupid and floored it at a stop light. i pulled 1st and 2nd all the way to 60. then i slowed down. (dont ask why i did it, i was bored i guess) anyway, after that the car felt slow. i turned my music down so i could listen. and when i would give it gas it made this sort of vibrating noise. but more like when you roll your r's when you speak. at first i thought i messed sumthing up in my tranny. but when i got home i put it in neutral and pushed the gas, and it still did it. my geuss is that its my catalytic coverter is clogged. its been broken ever since i got the car, but it never mad a difference so i didnt replacec it. any guesses/suggestion?