well i know something wrong with my second cat now the rpm jumps up and down at the stoplight not close to stalling but it should be smoother it could just need a tune up or new spark plugs but i cannot get her in until christmas break most likely

 

Iyou. could be about a 100 different things. If it has not been tuned up in a while i would start there. Also you could clean the Mass air flow sensor and change the fuel filter.