ok after i swapped my b16 when i sit at idle the car idles fine, but like if I hit the gas and rev the motor, when the rpms come back down slowly they will get to about 1000 and then just drop to about 400 and then go back up to 750. sometimes its so bad that when i put the car in neutral to stop at a light the car stalls. anyone have this problem or can help?

car has an act lightened flywheel if this makes a difference?

 

i have the same problem only i think my motor is stock, and it happens when i have lots of things running, heater lights and rear defroster and windsheild wipers yet to stall out though

makes me mad though cause i usually stall it becuase im unaware of it happening sometimes, other than the shaking

 

i have noticed my lights dimming with my speakers on, not even really up that loud. maybe its a ground or time for a new battery?

 

well the grounds are good, and i put in one more. car still does it, i dunno anymore

 

anyone else have this prob? could it be battery?

 

Sounds like it could be an alternator. Hook your car to another with a set of jumper cables. Then take the positive one off and see if it acts like it wants to stall out.