rattle

Hey all I am new to this forum, I just made an account but have been reading threads since I bought my eclipse in 2015. 2008 gt eclipse A few months ago i received a check engine code for spark plugs so I changed the front 3 plugs on the valve cover but left the ones under the intake manifold...

2001 GT 140,000 5 spd well im back here again from my first thread were i mentioned i had rattling noises. but this time i believe it escalated and now it almost sounds like i have aftermarket cams like there is a displaced rattle that goes up with rpms. i have no idea what it could be and it...