i have these code from the on board computer so what should i do p0340 which is no cam signal at PCM and p1391 which is interment loss of CMP or loss of cam position sensor. my car has been running rough for a while and the error codes i was getting from it was a misfire on cylinder 3 i was told to replace the plug wire which i have done and now those error codes are gone but replaced with these what should i do? thanks