My aveo was being a little lumpy at idle so I decided to use some seafoam. Well I sent it in through the PCV like it said but instead of only putting in 1/3 of a bottle the aveo quickly sucked up almost the whole bottle! Now I'm throwing a CEL code AND a HOLD code... and the car is running even more rough! So just be careful people! I hope that if I let the car idle for about 10 minutes maybe it'll clear up....