I have an 02 Legacy that is hesitating BADLY when you stomp on it from a dead stop, and the exhaust smells like rotten eggs. I bought it wrecked 3 years ago at auction, but hadn't had time to fix it until earlier this summer. I've done everything I can think of, but the hesitation is getting progressively worse. I even bought a $300 OBD2 code scanner and it tells me everything's fine. Anybody got any ideas?

Take a look a your battery ,but don't touch it . The smell of eggs maybe comes from acid that is getting out of your battery . This may be caused by a faulty alternator ( giving to much current ).

usually the smell of rotten eggs means your cats are gone.

How many miles have you put on it since you fixed it? Maybe its just a bad tank of gas or some old gas went bad in the system.

id check all the normal maintenance items. www.subaru.com has a schedule for your car. Id try new air and fuel filters since its been sitting so long. After that Id start looking at plugs,. wires, and sensors.

Has it lost power too? If so check your cat. Get a new gasket and disconnedt your exaust ahead of the cat. usually at the head. put in ear plugs and try it. if its ok get a new cat your old one is pluged.

my vote goes to the cat, the rotten egg smell is a classic clogged cat and the lack of exhaust flow could cause hesitation

ummmmm....... i found this an interesting question, but got lost in the answers. My cat is safe