I was recently driving on the freeway when my check engine through the codes: P0300, P0301, P0303 and P1399. I know these all indicate a misfire on Cylinders 1 and 3; however, the car wasn't failing or bogging out, only losing power. It has recently start to bog out only when idling. About two/three weeks ago, I changed out the spark plugs and the wires. Anyone have any suggestions on what to check/look out for?

 

Always change distributor cap and rotor also when wires and plugs need changing

 

that code right there more than likely is going to be your EGR valve ports plugged up , if you have h22a4-h22a1 , those usually plug up after some time with a carbon you have to a usually tap and remove the plugs on top of it and clean them out and replug them with oem plugs.
Search the p1399 code....