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2008 Grand Prix losing power going up hill



Please do, I had the exact same problem, car was having issues going up hills, misfiring when accelerating. Got rid of Cat and car stopped doing all of those things immediately. But don't wait too long, ended up having to replace engine because of it.
 
Update on power loss and flashing p0300 code.Before I had a chance to drop the cat to see if performance improved the car started running smooth again no codes no loss of power. Took car on highway and got on it hard no problems stumped on this one still would like any input why its started to run good again
 


sounds like your gonna drive it anyways lol buy yourself a new dp with cat. install it. problem solved.

if you were to hit the cat with the palm of your hand, cold of course, i bet you hear it rattle inside.
 
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