These are all exhaust leak symptoms. To find the exhaust leak, see this post.
Because an exhaust leak decreases exhaust backpressure, it can actually reduce engine performance, robbing you of power during acceleration. ill continue to lose power if the exhaust leak isn’t fixed.
Reduced Fuel Economy and a P0420 trouble code
Exhaust leak symptoms
An exhaust leak can occur near the exhaust manifold, at the flex pipe, any connection to the catalytic converter, exhaust pipe, muffler or tail pipe. An exhaust leak is dangerous and must be fixed right away. Here are the most common exhaust leak symptoms: