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Originally posted by MerF If the cat is bad, then the o2 may be going bad. Maybe also pull the PCV valve and shake it...if it doesn't rattle, get a new one.
dont gotta pull it. just clamp down on the hose with a pair of pliers while the car is running. if you hear a click, it's good.
it almost sounds like the ignition timing might be off too? that or its in limp mode like chahonda said....