240sx HELP!!

[Q-TiZzLe]

hi i was wondering if anyone knows whats wrong with my car?? okay so it jus started today. while on my way to work i noticed that when i press my gas pedal that there is a lag in power at first but once it gets going im good. when i start it now it starts but the idle gets rough nd then it dies. sounds like my cat is loose cuz it rattles a lil everytime i hit the gas.. if anyone knows it wuld be a great help cuz i really dont wanna take it to a mechanic u know?? thanks

[jontron5000]

a video might help

[camaro379ss]

If thats the case hit the cat with a rubber mallet and see if it truly does rattle. If so the baffles could have rotated and can cause your exhaust to be restricted and eventually engine will die.

At the same time this could be a heatshield....is this a sr or ka or.....

[chetos13]

fpr, dirty spark plugs, vacuum leaks