just wanted to update, it was the coils, replaces all the coils for 20$ each from ebay, and now engine runs perfect, feels like when i bought it brand new, also i replaced the valve cover seal with an aftermarket seal because the coils go when oil leaks into the spark plug wells. so it seems i had 2 problems at the same time, the pcv valve and misfiring due to bad coils. i wish the damn ecu would have picked that up and give me a check engine trouble code or something. its seems the ecu detected the misfire on the right side coils and then cutoff the fuel to the right 3 cylinders, but gave no check engine light,
hope this helps someone!