Last night i was driving and my buddy told me to get on it, instantly when i stepped into it the car bogged and got a little miss. My first reaction was a fuel problem so i ran seafoam and that did nothing but throw a code and the service light came one. Today i changed plugs, wires, and 2 coil packs. The missing has gotten worse and my buddy plugged his reader in and all its throwing is p300...random miss. Any tips?

before i seafoamed it it was only knocking when it was boosted. but now its doing it at idle