Quick question. I have a Daewoo Leganza, 2001. The weekend, I was in the
country driving and the car lost a lot of acceleration. When I jammed the
gas pedal down, the car's engine raced up but there was hardly any
acceleration. I felt the transmission shift at the appropriate speeds.

There is a whooshing/exhaust leak sound coming from under the engine. At
high speeds, it sounds like a whooshing. At idle, it sounds like an open
flex pipe.

The engine did not heat up at all even though I drove it this was for about
200 miles to get home. At about 63 miles per hour, there was a high pitch
whistle and I had to back it down to stop it. At around 65 mph, the car
started to buck.

Has anyone seen this problem before? Do you think I have a clogged catalytic
converter?

Any suggestions?

Thanks,
Frank