help!!!! bogging problems with focus

Hi, I have a 2000 Focus Zx3 with 99k miles on it. I installed a short ram intake on it the problem that i'm having is at times the car wants to bog and stall especially at stop light. I have disconnectd the battery and it still continues to bog. And when I lift the hood the engine shakes if anyone knw of anything i will appreciate it thanks.

My step daughter had the same problem. It was a vacuum line. Had to get it from a dealer.

check all the vacuum lines and check to make sure the MAF sensor is plugged in.