Quote Originally Posted by Nchristopherson View Post
My car has been having some interesting issues lately where it just does not want to make power. The car won't go over 3.5k RPMs ever, and if I put too much throttle in, it won't shift into the next gear and will start to actually decelerate. If I slowly stay in the gas, I can get up to speed, it just takes an incredibly long time.
I've had those exact symptoms on my 01. Twice. Both times the dealer replaced the cat (warranty). Both times it fixed it. There are 2 causes for the cat clogging. 1) there is some ceramic parts where the exhaust enters the cat which break up and literally block the exhaust flow. 2) is worse. metal from the pistons, cylinders and rings wears off and eventually causes the same symptoms. I'm only familiar with #1, and do not have any verification of #2, just was told that by the dealer.