I have a 2007 that I recently swapped out my down stream cat. Prior to the Cat malfunction, I got codes for a misfire. Checked all my plugs and nothing seemed wrong. Car drove fine for a few months until I changed the cat.
Now the car hesitates (chokes) to accelerate at high...
-Poor idling (400-450rpm) after driving a few miles.
-Car slightly "jerks" while driving, especially when WOT. (feels like the engine just loses all power for a split millisecond, but you can clearly feel a "jerk" when it happens).
Both of these problems do NOT happen when the car is...