I had to take of my throttle body and clean out both egr ports to pass emissions.3 days later im going nuts because now im runnig so rough that i originally thought i had a bad coil pack?so i have taken it 2 times to the parts store to have the codes tested.both times it tested all clear?then after the 2nd test i left it running and one by one unplugged my injectors to listen for a change?no change in the motor?wher do i go now?is this the symptoms of a stopped up cat?