This happened to me a few weeks ago, I took it to the shop and they told me it was my clogged exhaust system and my cat converter had been removed from my car.

So I buy a whole new cat converter with 2 o2 sensors, magnaflow cat back exhaust system, new ignition coil and starter.

My car ran fine for the past few days until today. My car will start to bogg down after a few miles of running, and then it will shut off on me. I can restart the car after a few tries, but once restarted the car wont go over 40 MPH and my exhaust will have a distorted deeper tone than normal. Does anyone know what could be causing this? Any help would be appreciated