So this winter my car has been acting up.. especially on cold days it bogs and wants to stall. Very few times it has stalled but will start aslong as you give it gas.. I know i need a new cad, but I have just changed all Sparks, Coils, pcv valve & elbow and the egr valve.. it still tends to chug every once and awhile just not as bad as before. Hasn't thrown any codes back up at me.. Does anyone have any idea what could be causing this, Also im hearing a cringing metal (When metals heated or the sound when you strike a spark) coming from the driver side wheelwell.. Sounds very similar to salt/rocks hitting my wheelwell but theres nothing on the road right now.. lol. Please help im stumped ~!