Hello all just bought a 2007 Titan two weeks ago and am having some issues. This weekend we were on the interstate and the truck started to stutter very violently and lose power. I got it off on the shoulder and after a few minutes I was able to drive it to the next exit where it began to limp along. I let it cool off for ~10mins and we reached our destination that was 5-10 miles away. There was a relay for the ecu in the glove box (left by the previous owner ) which i switched out after reading this forum. We made it halfway home and again violent shaking stuttering backfiring and loss of power. I plugged my scanner in and it gave me a bad camshaft position sensor code and a few others (including the 0420 and 0430) I replaced the sensor and reset the light. The truck ran better but then started its antics again. Now all I have are the two P0420 and P0430 codes but they are showing twice on the scanner. The violent shaking and loss of power only comes after the truck has been driven a while. My muffler guy says its unlikely both went out at the exact same time and I tend to agree. So any thoughts on what I may need to check or do before I replace the cats?