Just hoping to get my search narrowed down for this issue.
its running a little rough at idle, runs pretty good at an easy throttle, but absolutely doggy at any heavy throttle.
ive replaced the egr and an o2 sensor because I was getting a code for those here and there.
the car didn’t seem to run any different with the maf or any of the sensors on the air intake unplugged.
it also has been idling up for a while after coming to a stop, and runs pretty good then drops down to normal idle, and runs rougher.
any suggestions to narrow this down?

 

The last time I was getting a multiple random misfire like this, it was a coil pack going bad.

 

Experiencing the similar thing with error codes P0300 and P0420.
Based on my search it could be a lot of things but with the rattling sound from underneath the car I am suspecting that the catalytic converter needs replacement.