I recently bought a Scion xA and it was driving fine. The other day I went out to try and start it and it cranks but doesn't start. The obd reader had the codes P0301, P0304, P0335, P0300. I replaced all the coil packs, I replaced the MAF sensor, the coolant temp sensor, the air intake temp sensor, the crank and cam shaft positioning sensors, I put a new fuel pump in it, a new ECM, and a new starter, and it still won't start. I've checked fuses and they all seem fine, whats next? Do any of you know how I can fix it or where to go from here?