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I've got the same problem. 2002 buick, 3800v6. It's a great car, seats 6, gets 32mpg hwy, hugh trunk yadayada. My cat was clogged and filled with crap. When I go up a hill in overdrive, it wants to buck, cough. On a level road it's just fine. On a hill, give it gas and the cough goes away. Anyway, the computer readout said bad cat. I replaced it, $125 bucks, just cut the old one out. The problem is, the cough is still there. I just live with it because its not a big deal for me. But now I'll have to look elsewhere, maybe a vacume line bad, or, does my car have a MAF, I dont know, it is fuel injected. Good luck.
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