racecrew25

so, I scanned and pulled codes today. I've got a p0174, p0012, p0303,and p0340....it's been acting up for the last couple months throwing the CEL then it would go out on it's own. the next time you start it, it might sound like a powerstroke....I'm thinking about replacing the phasers, timing set, solenoids, and sensors. help a guy out, and point me in the right direction.
If it helps at all...right now, it runs alright at anything above 45mph. anything below and it shudders and misses a bit. at a stop and idling it's almost like sitting in a massage chair, it shakes that much.