I heard a rattling marble sound coming from underneath my 2002 gs300 and i had massive power loss it the car wouldnt go more than 20 mph. Finally it had gotten to the point where it wouldnt start up. I was told that it was the cat I replaced the cat immediately after replacing the cat I was able to start the car. But still no power car would not go more than 20 mph. Any suggestions?
FYI on my model the cat and the exhaust manifold is one assembly, so there's the exhaust manifold and two cats as one assembly.
