hows your battery doing? is it charging? when my alternator when out my car would drop really really low when i would be just idling and it would just be horrible...

 

okay man what else is goin on with the car ck all the vacuum lines cuz that is another reason it'll drop. for yours on ur EFI you'll see were ur intake pipe hooks upto the right there is a little deal that is circular thats your idle adjustment mess with that don't turn it too much cuz it doesn't take a lot too increase it.

 

charging system is great I have subwoofers (8) pushing 1100 watts. And itself is not the problem. It is after a hard running when it goes super low or when I come off the highway and drop my speed fast to 0. and the idle fluxuates low.

 

you may have a vacuum leak, i had the same problem with my 4th gen. It doesnt like to hold the idle. anywhere between 800-850-around 1000 rpm seems to keep the car happy, when its at normal operating temp. Even with my 5th gen, the car starts to vibrate if the idle starts heading around the 700 rpm range.